Elementary School Science Quiz: Observe Erosion Moving Materials
20 questions · exam conditions
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Observe Erosion Moving MaterialsQuestion 1 of 20

A glacier slowly moves rocks from a mountain valley to a pile near its melting edge. What evidence shows erosion?

Rocks are carried in the ice, and a new pile forms where ice melts.
Rocks sparkle in sunlight, so they must be new minerals.
Rocks grow larger in the valley without moving anywhere.
The glacier stops all movement, so rocks stay in one spot.
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Elementary School Science Quiz

Elementary School Science Quiz: Observe Erosion Moving Materials

Practice Observe Erosion Moving Materials in Elementary School Science with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Observe Erosion Moving Materials, giving you a quick way to practice the rules, question types, and explanations that matter most for Elementary School Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A glacier slowly moves rocks from a mountain valley to a pile near its melting edge. What evidence shows erosion?

  1. Rocks are carried in the ice, and a new pile forms where ice melts. (correct answer)
  2. Rocks sparkle in sunlight, so they must be new minerals.
  3. Rocks grow larger in the valley without moving anywhere.
  4. The glacier stops all movement, so rocks stay in one spot.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a glacier slowly moves rocks from a mountain valley to its melting edge. The evidence of erosion includes: rocks embedded in moving ice (transport mechanism) and a pile of rocks forming where the glacier melts (deposition site). The erosion agent is ice (glacier), shown by the slow movement of the ice mass. Materials are moving from the mountain valley to the glacier's terminus, which we can observe by rock accumulation at the melting edge. Choice A is correct because it identifies rocks being carried in the ice and deposited where ice melts. The observations support this: glaciers pick up rocks as they move, transport them frozen in ice, and deposit them when melting releases the rocks. This demonstrates understanding that erosion is visible through material movement and deposition. Choice D is incorrect because it states the glacier stops all movement, contradicting the observation of rock transport. This error occurs when students don't understand that glaciers are moving ice that can transport materials. Critical distinction: Glaciers are rivers of ice that move slowly but steadily, carrying embedded materials long distances. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 2

Based on what you see, where did the wind-blown sand go after leaving the dry beach?

  1. It was carried inland and deposited as a small dune behind grass. (correct answer)
  2. It sank straight down into the ground and disappeared.
  3. It moved into the ocean against the wind and piled at the shoreline.
  4. It turned into rock without moving away from the beach.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, wind is blowing sand from the dry beach area. The evidence of erosion includes: sand being picked up from the beach (source) and deposited inland behind grass as a small dune (deposition site). The erosion agent is wind, shown by the direction of transport away from the water and inland. Materials are moving from the dry beach to areas behind vegetation, which we can observe by dune formation where wind speed decreases. Choice A is correct because it identifies wind carrying sand inland and depositing it as a dune behind grass where wind slows. The observations support this: wind picks up dry sand, carries it inland, and deposits it where grass reduces wind speed. This demonstrates understanding that erosion is visible through material movement and deposition. Choice C is incorrect because it states sand moved against the wind direction toward the ocean. This error occurs when students don't understand that materials move in the direction of the erosion agent (with the wind, not against it). Critical distinction: Erosion agents move materials in predictable directions - wind blows materials away from source in wind direction. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 3

These observations show erosion by waves moving sand from the beach to deeper water. What evidence shows transport?

  1. The beach has more shells, and the sand stays the same height.
  2. The sand gets warmer in the sun, so it changes color.
  3. Waves make the water foamy, but no sand moves anywhere.
  4. The beach edge is missing sand, and a new sand pile forms offshore. (correct answer)
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, waves are eroding sand from the beach and transporting it to deeper water. The evidence of erosion includes: the beach edge missing sand (source depletion) and a new sand pile forming offshore (deposition site). The erosion agent is waves (water), shown by wave action at the beach. Materials are moving from the beach edge to offshore locations, which we can observe by the pattern of removal at the waterline and accumulation in deeper water. Choice D is correct because it identifies both components of erosion evidence - sand missing from the beach edge (source) and new sand pile offshore (deposition). The observations support this: waves remove sand from the beach, transport it seaward, and deposit it where wave energy decreases. This demonstrates understanding that erosion is visible through material movement and deposition. Choice A is incorrect because it focuses on shells rather than sand movement, missing the erosion evidence. This error occurs when students don't recognize transport evidence or focus on unrelated changes. Critical distinction: Erosion requires observable movement of materials from one location to another, not just changes in what's present. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 4

Based on what you see, which agent is moving sand from the streambank to a sandbar?

  1. Wind is blowing sand from the sandbar back onto the streambank.
  2. Flowing water is carrying sand from the streambank downstream and depositing it. (correct answer)
  3. Weathering is breaking rocks into sand, but the sand stays in place.
  4. People are shoveling sand from the streambank and piling it in the stream.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, sand is moving from the streambank to form a sandbar downstream. The evidence of erosion includes: sand missing from the streambank (source depletion) and new sand accumulating as a sandbar (deposition site). The erosion agent is flowing water, shown by the stream's movement and the downstream direction of transport. Materials are moving from the streambank to the sandbar location, which we can observe by the pattern of removal and deposition along the water's flow path. Choice B is correct because it identifies flowing water as the agent carrying sand downstream and depositing it to form the sandbar. The observations support this: water flow provides the transport mechanism, sand moves in the direction of flow, and deposition occurs where water slows. This demonstrates understanding that erosion is visible through material movement and deposition. Choice C is incorrect because it confuses weathering with erosion by stating sand stays in place. This error occurs when students don't distinguish weathering (breaking) from erosion (moving). Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 5

After heavy rain, muddy runoff carries soil from a hilltop to a ditch. These observations show erosion by  .

  1. ice, freezing soil and lifting it up to the hilltop
  2. wind, blowing soil uphill into the ditch
  3. water, washing soil downhill and depositing it in the ditch (correct answer)
  4. weathering, breaking soil into smaller pieces without moving it
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, heavy rain creates muddy runoff carrying soil from a hilltop to a ditch. The evidence of erosion includes: muddy water (sediment in transport), soil missing from hilltop (source depletion), and soil accumulating in the ditch (deposition). The erosion agent is water, shown by the runoff flowing downhill. Materials are moving from the hilltop to the ditch below, which we can observe by the muddy color indicating suspended sediment. Choice C is correct because it identifies water as the agent washing soil downhill and depositing it in the ditch. The observations support this: rain creates runoff, water flows downhill carrying soil, and deposition occurs where water slows in the ditch. This demonstrates understanding that erosion is visible through material movement and deposition. Choice D is incorrect because it confuses weathering with erosion by not acknowledging soil movement. This error occurs when students don't distinguish weathering (breaking) from erosion (moving). Critical distinction: The muddy runoff proves soil is being transported, not just broken down in place. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 6

After days of rain, soil slides from a steep slope to the bottom. Which agent is moving the material?

  1. Gravity is pulling soil downhill from the slope to the bottom pile. (correct answer)
  2. Wind is blowing soil upward from the bottom back to the slope.
  3. Ice is freezing soil and pushing it higher up the hill.
  4. Weathering is cracking rocks, but nothing moves down the slope.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, soil slides from a steep slope to the bottom after rain. The evidence of erosion includes: soil missing from the slope (source depletion) and soil accumulating at the bottom (deposition). The erosion agent is gravity, shown by the downward movement of material on the steep slope. Materials are moving from the upper slope to the base, which we can observe by the slide path and pile formation. Choice A is correct because it identifies gravity pulling soil downhill from the slope to the bottom pile. The observations support this: rain saturates soil reducing friction, gravity pulls the loosened soil downward, and deposition occurs at the slope base. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it states wind blows soil upward, which contradicts both gravity and the observation of downward movement. This error occurs when students don't understand that gravity always pulls materials downward on slopes. Critical distinction: On steep slopes, gravity is often the primary erosion agent, especially when rain reduces soil stability. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 7

In a stream study, Chen sees pebbles roll from a fast riffle into a calm pool. Where did the pebbles go?

  1. They moved upstream into the riffle because calm water pushes them back.
  2. They were carried into the calm pool and deposited on the bottom. (correct answer)
  3. They stayed in the riffle, even though Chen watched them roll away.
  4. They turned into sand in place without being transported by water.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, Chen sees pebbles roll from a fast riffle into a calm pool. The evidence of erosion includes: pebbles in motion (rolling) and movement from fast water to calm water area. The erosion agent is flowing water, shown by the stream current moving the pebbles. Materials are moving from the riffle to the pool, which we can observe by Chen watching them roll downstream. Choice B is correct because it states pebbles were carried into the calm pool and deposited on the bottom. The observations support this: fast water in riffles can move pebbles, pebbles roll downstream with the current, and deposition occurs in calm pools where water velocity decreases. This demonstrates understanding that erosion is visible through material movement and deposition. Choice A is incorrect because it states pebbles moved upstream, which is impossible as water flows downstream and materials cannot move against the current. This error occurs when students don't understand that erosion follows the direction of the transporting agent. Critical distinction: Materials always move in the direction of the erosion agent - downstream with water flow, not upstream against it. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 8

A river carries brown sediment from upstream and drops it where it meets a lake. How is erosion changing the landscape?

  1. Sediment is transported downstream and deposited, building a delta at the lake edge. (correct answer)
  2. Sediment moves upstream and removes the lake, making it deeper instantly.
  3. Rocks break in place, so the riverbank grows taller without transport.
  4. People add sediment by dumping soil, not by river movement.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a river carries brown sediment and deposits it where the river meets a lake. The evidence of erosion includes: brown color showing sediment in transport and delta formation at the lake edge (deposition). The erosion agent is flowing river water, shown by the downstream transport direction. Materials are moving from upstream sources to the river-lake junction, which we can observe by sediment accumulation building the delta. Choice A is correct because it describes sediment transported downstream and deposited to build a delta at the lake edge. The observations support this: rivers carry sediment from upstream erosion, transport it in the water (brown color), and deposit it where flow slows at the lake, building a delta landform. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it states sediment moves upstream and removes the lake, which contradicts how water flows and how deltas form. This error occurs when students don't understand that water and its sediment load flow downhill/downstream. Critical distinction: Rivers flow from high to low elevation, carrying sediment downstream, and deposit it where flow slows (like at lakes or oceans). To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 9

These observations show erosion by wind; what material is being transported away?

  1. Dust and fine soil are lifted from dry ground and carried downwind. (correct answer)
  2. Large boulders are carried through the air for miles by wind.
  3. Bedrock is melting into lava and flowing across the desert.
  4. Water droplets are freezing and falling upward into clouds.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, wind in a dry area is lifting and carrying dust and soil. The evidence of erosion includes visible dust clouds and bare ground where material was removed. The erosion agent is wind, shown by the blowing action carrying fine particles. Materials are moving from dry ground to downwind locations, which we can observe by dust in the air and potential distant deposits. Choice A is correct because it identifies materials being moved (dust and fine soil) and describes transport evidence (lifted from dry ground and carried downwind). The observations support this: bare ground = material removed, dust in air = in transport. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it exaggerates wind's capability, suggesting it carries large boulders, which is not typical for wind erosion. This error occurs when students don't recognize wind's limitation to lightweight materials or confuse agents. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 10

During a dust storm, dirt lifts from a dry field and settles on cars miles away. What material is being moved?

  1. Dust and fine soil are transported by wind from the field to the town. (correct answer)
  2. Large boulders are rolled by wind from the town back to the field.
  3. Water carries mud from the cars into the field during the storm.
  4. Weathering changes dirt into dust, but it stays on the field.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a dust storm lifts dirt from a dry field and deposits it on cars miles away. The evidence of erosion includes: dirt lifted into the air (material in transport) and dirt settling on distant cars (deposition). The erosion agent is wind, shown by the dust storm conditions. Materials are moving from the dry field to locations miles away, which we can observe by the dust in the air and coating on cars. Choice A is correct because it identifies dust and fine soil as the materials transported by wind from field to town. The observations support this: wind picks up lightweight particles (dust and fine soil), carries them through the air, and deposits them on surfaces miles away. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it claims wind rolls large boulders, which is impossible - wind can only move small, lightweight particles. This error occurs when students don't understand the relationship between particle size and erosion agent strength. Critical distinction: Different erosion agents can move different sized materials - wind moves dust and sand, water moves larger particles, ice moves biggest rocks. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 11

Based on what you see, which agent is carrying sediment downstream in the stream?

  1. Ice is moving sand from the stream bottom to the riverbank.
  2. Flowing water is moving sand and pebbles from the bank to downstream. (correct answer)
  3. Wind is blowing gravel from the stream to the hillside.
  4. People are shoveling mud from downstream back into the stream.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a stream shows flowing water carrying sediment downstream, with visible sand and pebbles moving along the bottom or in the current. The evidence of erosion includes muddy water showing sediment being carried and pebbles tumbling along the streambed. The erosion agent is water, shown by the flowing stream present. Materials are moving from the stream bank to downstream locations, which we can observe by the sediment in motion and bare spots on the bank. Choice B is correct because it identifies materials being moved (sand and pebbles) and correctly names the erosion agent (flowing water) while describing transport evidence (from the bank to downstream). The observations support this: muddy water = sediment in transport, bare bank = soil removed, and potential deposits downstream = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice A is incorrect because it confuses the erosion agent with ice instead of water and wrongly suggests movement to the riverbank rather than downstream. This error occurs when students don't distinguish the correct agent based on the visible flowing water or misidentify the direction of transport. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 12

The evidence indicates heavy rain caused erosion; what moved from hillside to ditch?

  1. Soil washed downhill in muddy water and collected in the ditch. (correct answer)
  2. Sunlight melted the soil and turned it into a puddle.
  3. Wind lifted rocks upward from the ditch to the hilltop.
  4. Plants grew new soil in the ditch and pushed it uphill.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, heavy rain on a hillside causes soil to wash into a ditch, with visible muddy water and soil accumulation. The evidence of erosion includes muddy water flowing downhill and soil piles in the ditch. The erosion agent is water (rain), shown by the flowing runoff. Materials are moving from the hillside to the ditch, which we can observe by eroded bare spots uphill and deposits below. Choice A is correct because it identifies materials being moved (soil) and describes transport evidence (washed downhill in muddy water to collect in ditch). The observations support this: muddy water = sediment in transport, bare hillside = soil removed, ditch piles = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it confuses weathering or melting with erosion and denies movement by suggesting soil turns into a puddle without transport. This error occurs when students attribute changes to wrong causes or don't recognize transport evidence. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 13

Based on what you see, where did wind-blown sand end up after moving?

  1. It stayed in the same spot, just breaking into smaller pieces.
  2. It moved from the dune to the ocean floor upstream.
  3. It moved from the flat beach into a dune piled behind driftwood. (correct answer)
  4. It moved from the dune back into solid rock on the cliff.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, wind is blowing sand on a beach, forming a dune behind driftwood. The evidence of erosion includes sand shifting from the flat beach into a piled dune. The erosion agent is wind, shown by the blowing action moving lightweight sand. Materials are moving from the flat beach to behind the driftwood, which we can observe by the forming dune and bare spots on the beach. Choice C is correct because it identifies materials being moved (sand) and describes the deposition site (dune piled behind driftwood). The observations support this: flat beach as source = sand removed, dune formation = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice A is incorrect because it confuses weathering with erosion by stating the material stayed in place and only broke down. This error occurs when students don't distinguish weathering (breaking) from erosion (moving) or fail to recognize transport evidence. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 14

After waves hit a rocky shore, sand is missing near the waterline and appears farther down the beach. What moved it?

  1. Waves moved sand along the shore from the waterline to a new beach area. (correct answer)
  2. Gravity pulled sand upward from the new area back to the waterline.
  3. Weathering broke sand into smaller sand, but it did not travel.
  4. Wind carried sand underwater and deposited it on the ocean floor immediately.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, waves hit a rocky shore and sand disappears from the waterline but appears farther down the beach. The evidence of erosion includes: sand missing near the waterline (source depletion) and sand appearing farther down the beach (deposition). The erosion agent is waves (water), shown by wave action along the shore. Materials are moving from the waterline area to locations along the beach, which we can observe by the pattern of removal and deposition. Choice A is correct because it identifies waves moving sand along the shore from the waterline to a new beach area. The observations support this: waves pick up sand at the waterline, transport it along the shore (longshore drift), and deposit it farther down the beach. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it states gravity pulled sand upward, which is impossible as gravity only pulls downward. This error occurs when students don't understand that gravity cannot move materials upward. Critical distinction: Waves can move sand laterally along shores through longshore drift, while gravity only moves materials downward. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 15

These observations show erosion by ice; where did the rocks go after melting?

  1. They disappeared when the glacier melted into the air.
  2. They moved with the glacier and were deposited in a pile at its end. (correct answer)
  3. They broke in place on the mountain without moving anywhere.
  4. They floated upstream to the top of the glacier.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a glacier is melting, revealing rocks that were carried within the ice. The evidence of erosion includes rocks deposited in a pile at the glacier's end, far from their source. The erosion agent is ice (glacier), shown by the moving ice mass. Materials are moving from the mountain source to the glacier's terminus, which we can observe by rocks embedded in ice and final deposits. Choice B is correct because it identifies materials being moved (rocks) and describes transport evidence (moved with glacier and deposited in pile at end). The observations support this: rocks in ice = in transport, pile at end = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice C is incorrect because it confuses weathering with erosion by focusing on breaking in place without movement. This error occurs when students don't distinguish weathering (breaking) from erosion (moving) or fail to recognize transport by ice. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 16

Based on what you see, what evidence shows a mudslide moved earth materials downhill?

  1. A fresh bare scar on the slope and a new pile of soil at the bottom. (correct answer)
  2. Rocks sparkle in sunlight, showing they are getting hotter.
  3. Leaves change color, showing seasons are changing.
  4. The hill grows taller because soil is being added from the sky.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a slope shows signs of a mudslide, with a bare scar uphill and soil piled at the bottom. The evidence of erosion includes the fresh bare scar on the slope and a new pile of soil at the bottom. The erosion agent is gravity, shown by the downhill slide on the slope. Materials are moving from the upper slope to the base, which we can observe by the scar as source and pile as deposition. Choice A is correct because it identifies materials being moved (earth materials) and describes transport evidence (bare scar as removal and pile at bottom as arrival). The observations support this: bare scar = material removed, soil pile = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice D is incorrect because it wrongly suggests materials are added from the sky rather than moved downhill, denying erosion's transport. This error occurs when students attribute changes to wrong causes or don't recognize gravity's role in movement. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 17

These observations show what evidence that waves are moving sand along the beach?

  1. Sand piles up near a jetty while the nearby beach looks smaller. (correct answer)
  2. Beach rocks crack into smaller pieces but stay in the same place.
  3. New shells appear because animals moved them onto the beach.
  4. The sand gets warmer in the sun, so it spreads out.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, waves along a beach with a jetty show sand accumulating on one side while the beach erodes on the other. The evidence of erosion includes sand piling up near the jetty and the nearby beach appearing smaller. The erosion agent is water (waves), shown by the wave action along the shore. Materials are moving from the eroding beach to the area near the jetty, which we can observe by the depleted beach area and new sand deposits. Choice A is correct because it identifies materials being moved (sand) and describes transport evidence (piling up near jetty while beach shrinks). The observations support this: smaller beach = sand removed, sand piles = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice B is incorrect because it confuses weathering with erosion by focusing on breaking rocks in place without movement. This error occurs when students don't distinguish weathering (breaking) from erosion (moving) or fail to recognize transport evidence. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 18

These observations show rain erosion; what evidence shows soil was transported downhill?

  1. Small channels lead to a muddy pile of soil at the bottom of the hill. (correct answer)
  2. The hill has the same shape, but the rocks look shinier.
  3. The soil turns into bigger rocks as it rolls uphill.
  4. The grass grows taller, so the hill must be eroding faster.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, rain on a hill creates small channels and a muddy soil pile at the bottom. The evidence of erosion includes small channels leading to a muddy pile of soil at the bottom of the hill. The erosion agent is water (rain), shown by the runoff carving channels. Materials are moving from the hilltop to the base, which we can observe by channels as paths and pile as deposition. Choice A is correct because it identifies materials being moved (soil) and describes transport evidence (channels leading to muddy pile at bottom). The observations support this: channels = transport paths, muddy pile = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice C is incorrect because it wrongly suggests soil turns into bigger rocks rolling uphill, denying downhill movement. This error occurs when students misidentify direction of transport or confuse erosion with growth. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 19

How is erosion changing the landscape when rain makes channels down a hill?

  1. Soil is carried from the hilltop into a ditch, making small gullies (correct answer)
  2. Soil is created on the hill, making the slope taller each storm
  3. Rocks melt into lava and flow uphill, filling the channels
  4. The hill stays the same because erosion never moves materials
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, rain is making channels down a hill, showing water as the agent through runoff. The evidence of erosion includes: soil carried into ditches forming gullies, with the erosion agent being water, shown by rain flow. Materials are moving from hilltop (source) to ditches (deposition), which we can observe by forming gullies. Choice A is correct because it identifies materials being moved and how erosion changes the landscape by creating gullies. The observations support this: carried soil shows transport, hill channels indicate removal, and ditch piles show arrival. This demonstrates understanding that erosion is visible through material movement and deposition. Choice D is incorrect because it denies movement and claims erosion doesn't change landscapes. This error occurs when students don't recognize transport evidence. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).

Question 20

Based on what you see, how is a river forming a delta at a lake?

  1. The river carries sediment from upstream and deposits it where the water slows. (correct answer)
  2. The lake waves carry sediment upstream and remove the riverbank.
  3. The river breaks rocks in place, but no sediment moves anywhere.
  4. Animals build the delta by stacking pebbles from the lake bottom.
Explanation: This question tests 4th grade ability to observe erosion moving earth materials (NGSS 4-ESS2-1). Students must recognize evidence that materials are being transported from one location to another by erosion agents. Erosion is different from weathering: weathering breaks down rocks IN PLACE, erosion MOVES materials from place to place. Erosion agents transport materials: (1) Water - carries sand, silt, rocks downstream or along shore, evidence is muddy water or sediment deposits, (2) Wind - picks up and carries dust, sand, deposits in new locations, evidence is sand dunes or dust in air, (3) Ice - glaciers carry rocks frozen in ice, evidence is rocks far from source, (4) Gravity - materials slide or fall downhill, evidence is piles at slope base. Observable evidence of erosion: materials in motion (sand in water, dust in wind), depleted source areas (eroded hillsides), deposition sites (sandbars, dunes, deltas), material in transport medium (muddy water = sediment being carried). In this observation, a river enters a lake, forming a delta with sediment buildup. The evidence of erosion includes sediment-laden water depositing material where the flow slows. The erosion agent is water (river), shown by the flowing current carrying sediment. Materials are moving from upstream sources to the lake delta, which we can observe by muddy river water and growing delta deposits. Choice A is correct because it identifies materials being moved (sediment) and describes transport evidence (carried from upstream and deposited where water slows). The observations support this: upstream erosion = source, sediment in river = transport, delta buildup = materials arriving. This demonstrates understanding that erosion is visible through material movement and deposition. Choice C is incorrect because it confuses weathering with erosion by stating rocks break in place without movement. This error occurs when students don't distinguish weathering (breaking) from erosion (moving) or deny transport. Critical distinction: Weathering = breaking down in original location; Erosion = moving broken materials to new location. Both often occur together but are different processes. To help students observe erosion: Make it visible - create model erosion: (1) Water erosion: Pour water on sand/soil hill, watch it carve channels and carry material down, (2) Wind erosion: Use fan to blow sand, observe movement and dune formation. Observe real erosion: Stream after rain (brown/muddy = carrying sediment), beach after storm (sand moved), construction site (exposed soil washes away). Identify the three components: (1) Source (where material comes from - being eroded), (2) Transport (material in motion - being carried), (3) Deposition (where material settles - being deposited). Practice: For each observation, identify all three - 'Where did material start? How is it moving? Where is it going?' Compare weathering vs. erosion: Weathering makes small pieces (breaks down), Erosion moves the pieces away (transports). Often happen together: weathering breaks, erosion carries away. Key observations: Materials in motion (sediment in water, dust in air), depleted areas (where material removed), built-up areas (where material deposited).