Observe Erosion Moving Materials - 4th Grade Science
Card 1 of 20
Which tool is most appropriate to record a clear observation of erosion over time at one spot?
Which tool is most appropriate to record a clear observation of erosion over time at one spot?
Tap to reveal answer
Photographs taken from the same location over time. Photos document changes, showing material movement over time.
Photographs taken from the same location over time. Photos document changes, showing material movement over time.
← Didn't Know|Knew It →
Which agent of erosion is most directly shown by sand dunes forming and shifting over time?
Which agent of erosion is most directly shown by sand dunes forming and shifting over time?
Tap to reveal answer
Wind. Wind picks up and deposits sand particles in new locations.
Wind. Wind picks up and deposits sand particles in new locations.
← Didn't Know|Knew It →
Which agent of erosion is most directly shown by a river carrying muddy water after a storm?
Which agent of erosion is most directly shown by a river carrying muddy water after a storm?
Tap to reveal answer
Moving water. Suspended sediment shows water carrying eroded materials.
Moving water. Suspended sediment shows water carrying eroded materials.
← Didn't Know|Knew It →
Which agent of erosion is most directly shown by soil slowly moving downhill after heavy rain?
Which agent of erosion is most directly shown by soil slowly moving downhill after heavy rain?
Tap to reveal answer
Gravity. Gravity pulls saturated soil downslope in mass wasting.
Gravity. Gravity pulls saturated soil downslope in mass wasting.
← Didn't Know|Knew It →
Which agent of erosion is most directly shown by a glacier pushing rocks and soil as it moves?
Which agent of erosion is most directly shown by a glacier pushing rocks and soil as it moves?
Tap to reveal answer
Ice (glaciers). Glacial ice acts like a bulldozer, scraping and transporting debris.
Ice (glaciers). Glacial ice acts like a bulldozer, scraping and transporting debris.
← Didn't Know|Knew It →
What observation best shows deposition has occurred after erosion?
What observation best shows deposition has occurred after erosion?
Tap to reveal answer
Sediment is dropped and builds up in a new place. Deposition occurs when erosion agents lose energy and drop sediment.
Sediment is dropped and builds up in a new place. Deposition occurs when erosion agents lose energy and drop sediment.
← Didn't Know|Knew It →
Identify the process shown: footprints in loose soil disappear after strong wind blows.
Identify the process shown: footprints in loose soil disappear after strong wind blows.
Tap to reveal answer
Wind erosion moving the loose soil. Wind picked up and transported loose soil particles away.
Wind erosion moving the loose soil. Wind picked up and transported loose soil particles away.
← Didn't Know|Knew It →
What landform is commonly built by deposition where a river meets an ocean or lake?
What landform is commonly built by deposition where a river meets an ocean or lake?
Tap to reveal answer
A delta. Rivers slow at mouths, depositing sediment in triangular shapes.
A delta. Rivers slow at mouths, depositing sediment in triangular shapes.
← Didn't Know|Knew It →
Which option is the clearest observation of erosion: rock cracking in place or soil washing into a ditch?
Which option is the clearest observation of erosion: rock cracking in place or soil washing into a ditch?
Tap to reveal answer
Soil washing into a ditch. Washing shows movement; cracking is weathering without transport.
Soil washing into a ditch. Washing shows movement; cracking is weathering without transport.
← Didn't Know|Knew It →
Identify the evidence of erosion: a stream becomes wider over several years in the same location.
Identify the evidence of erosion: a stream becomes wider over several years in the same location.
Tap to reveal answer
The stream removed soil from its banks. Flowing water erodes banks outward, widening the channel.
The stream removed soil from its banks. Flowing water erodes banks outward, widening the channel.
← Didn't Know|Knew It →
Which agent of erosion is moving water (rivers, rain runoff, waves): wind, water, ice, or gravity?
Which agent of erosion is moving water (rivers, rain runoff, waves): wind, water, ice, or gravity?
Tap to reveal answer
Water. Rivers, rain, and waves all move earth materials through flowing water.
Water. Rivers, rain, and waves all move earth materials through flowing water.
← Didn't Know|Knew It →
Which term means earth materials are dropped in a new place after moving: erosion or deposition?
Which term means earth materials are dropped in a new place after moving: erosion or deposition?
Tap to reveal answer
Deposition. Erosion moves materials; deposition drops them in new locations.
Deposition. Erosion moves materials; deposition drops them in new locations.
← Didn't Know|Knew It →
Identify the best evidence that erosion moved material from one place to another.
Identify the best evidence that erosion moved material from one place to another.
Tap to reveal answer
Sediment is missing from one area and built up elsewhere. Material removed from one spot appears in another location.
Sediment is missing from one area and built up elsewhere. Material removed from one spot appears in another location.
← Didn't Know|Knew It →
Which observation best shows plant roots reduce erosion on a slope?
Which observation best shows plant roots reduce erosion on a slope?
Tap to reveal answer
Soil stays in place better where grass or plants cover it. Roots hold soil particles together, preventing erosion.
Soil stays in place better where grass or plants cover it. Roots hold soil particles together, preventing erosion.
← Didn't Know|Knew It →
Which observation shows that faster-moving water can carry more sediment than slower water?
Which observation shows that faster-moving water can carry more sediment than slower water?
Tap to reveal answer
Muddy, fast water carries larger particles than calm water. Fast water has more energy to lift and carry sediment.
Muddy, fast water carries larger particles than calm water. Fast water has more energy to lift and carry sediment.
← Didn't Know|Knew It →
Which observation best shows that steeper slopes increase erosion by runoff?
Which observation best shows that steeper slopes increase erosion by runoff?
Tap to reveal answer
More soil is washed away on a steep slope than a gentle slope. Gravity and water work faster on steeper surfaces.
More soil is washed away on a steep slope than a gentle slope. Gravity and water work faster on steeper surfaces.
← Didn't Know|Knew It →
Identify the observation that best shows gravity causing erosion.
Identify the observation that best shows gravity causing erosion.
Tap to reveal answer
A landslide moving soil and rocks downhill. Gravity pulls unstable materials down steep slopes quickly.
A landslide moving soil and rocks downhill. Gravity pulls unstable materials down steep slopes quickly.
← Didn't Know|Knew It →
Which observation shows deposition at the mouth of a river entering a lake?
Which observation shows deposition at the mouth of a river entering a lake?
Tap to reveal answer
A delta or sandbar forming where the river slows. Rivers drop sediment when they slow down entering larger bodies.
A delta or sandbar forming where the river slows. Rivers drop sediment when they slow down entering larger bodies.
← Didn't Know|Knew It →
Which observation best shows erosion happening along a stream bank?
Which observation best shows erosion happening along a stream bank?
Tap to reveal answer
The bank is undercut and soil falls into the water. Flowing water removes support, causing bank collapse.
The bank is undercut and soil falls into the water. Flowing water removes support, causing bank collapse.
← Didn't Know|Knew It →
Which observation best shows waves causing erosion on a coastline?
Which observation best shows waves causing erosion on a coastline?
Tap to reveal answer
Cliffs or shorelines wearing away where waves hit. Wave energy breaks rock and carries away the pieces.
Cliffs or shorelines wearing away where waves hit. Wave energy breaks rock and carries away the pieces.
← Didn't Know|Knew It →