Comparing Land Change Solutions - 2nd Grade Science
- What is a barrier used to block or slow moving water called?
- A dam or barrier. These structures control water flow and prevent flooding.
- What is the purpose of placing rocks or sandbags along a shoreline?
- To block waves and reduce erosion. These barriers absorb wave energy before it hits shore.
- Which solution best reduces runoff on a hill: terraces (step-like levels) or a smooth steep slope?
- Terraces (step-like levels). Steps slow water flow and reduce its erosive power.
- Which solution best slows water running downhill: terraces or a smooth steep slope?
- Terraces. Flat steps break up water flow and reduce its speed.
- Which agent of change can wash soil downhill during rain: wind or water?
- Water. Flowing water has force to carry soil particles downward.
- What is the name of the process when wind or water carries away soil and rock?
- Erosion. Movement of soil/rock by wind or water to a new location.
- Which solution best slows rainwater on a slope: mulch/ground cover or smooth bare dirt?
- Mulch or ground cover. Rough surfaces slow water and absorb impact.
- Which solution best reduces flooding and erosion: wetlands or covering land with concrete?
- Wetlands. Natural areas absorb water and slow its flow.
- Which option best prevents soil from washing away: plant roots holding soil or smooth pavement?
- Plant roots holding soil. Roots create a network that grips and stabilizes soil.
- Which option is the best general choice to prevent erosion: keeping land covered with plants or removing vegetation?
- Keeping land covered with plants. Plants provide year-round protection from both wind and water.
- What are terraces used for on steep land?
- Step-like levels that slow water and reduce erosion. Breaking slope into steps reduces water speed.
- What is one main way plant roots help prevent erosion?
- They hold soil in place. Roots bind soil particles together like a net.
- Which solution best reduces water erosion in a drainage ditch: lining with plants or making it deeper?
- Lining with plants. Plant roots stabilize banks and slow water flow.
- Which option best slows wind erosion in a field: a line of trees or bare ground?
- A line of trees (windbreak). Trees block wind and reduce its speed near the ground.
- Which agent of erosion is most likely when you see soil carried downstream?
- Water. Rivers and streams transport soil particles downstream.
- What is the main way plant roots help prevent erosion?
- They hold soil in place. Roots form underground networks that grip soil particles.
- Which option is best for stopping sand from blowing away at a beach: dunes with plants or flat bare sand?
- Dunes with plants. Plant roots stabilize sand and block wind at ground level.
- What is the name of the process when wind or water breaks rock into smaller pieces?
- Weathering. Breaking down of rock into smaller pieces without moving them.
- Which option best reduces wind erosion on a farm: leaving crop stubble or clearing all plants?
- Leaving crop stubble (ground cover). Dead plants shield soil from direct wind contact.
- Which option best slows water erosion on a hillside: planting grass or removing plants?
- Planting grass. Roots hold soil in place and absorb water.
- Which solution best slows a small stream from cutting deeper: adding rocks to slow flow or removing rocks?
- Adding rocks to slow flow. Rocks create obstacles that reduce water speed.
- What is riprap?
- Large rocks placed to protect soil from moving water. Absorbs water energy and prevents soil movement.
- Which solution best protects riverbanks from washing away: rocks (riprap) or bare soil?
- Rocks (riprap). Heavy rocks protect soil from fast-moving water.
- What is one way dunes with plants help prevent erosion?
- They trap sand and reduce wind speed near the ground. Plants stabilize sand and block wind movement.
- Which choice is a better solution for wind erosion: fence with slats that lets some air through or no barrier?
- A slatted fence (wind fence). Slats reduce wind speed while preventing pressure buildup.
- Which agent of change moves sand into dunes: wind or water?
- Wind. Wind picks up and carries loose sand particles.
- What is weathering?
- Weathering is the breaking of rock into smaller pieces. This process happens before erosion moves the pieces.
- Identify the best reason plants reduce erosion: roots hold soil or leaves make soil heavier?
- Roots hold soil. Root networks physically bind soil particles together.
- Which solution is designed to stop waves from wearing away a beach: seawall or sandbox?
- Seawall. A wall built to protect the shore from wave action.
- Which solution best protects a cliff edge from wave erosion: seawall or removing rocks at the base?
- Seawall. Solid barrier blocks waves from hitting the cliff directly.
- Which solution best reduces wind erosion on farmland: planting trees or paving soil?
- Planting trees (windbreaks). Trees block wind from reaching and lifting soil.
- Which solution best reduces erosion after a wildfire: planting ground cover or leaving soil bare?
- Planting ground cover. Plants quickly establish roots to stabilize exposed soil.
- Which solution best prevents wind from picking up soil: cover crops or dry loose soil?
- Cover crops. Plants protect soil surface from direct wind contact.
- Which solution best prevents beach sand from blowing away: sand fences or removing dunes?
- Sand fences. Fences trap sand before wind can carry it away.
- Which option best prevents soil from washing away: plant roots or loose dry sand?
- Plant roots. Roots bind soil particles together preventing washout.
- What is a windbreak?
- A row of trees or shrubs that slows the wind. Acts as a barrier to reduce wind speed and erosion.
- What does ground cover mean in erosion prevention?
- Plants or plant leftovers that cover and protect soil. Shields soil from direct wind and rain impact.
- Which option best prevents soil loss in gardens: mulch or spraying soil with water daily?
- Mulch. Covers soil to protect from rain impact and runoff.
- What is a terrace in farming?
- A step-like flat area on a slope that slows water runoff. Creates level surfaces that prevent water from rushing downhill.
- Which solution best slows water near a stream bank: rocks along the bank or removing rocks?
- Rocks along the bank. Rocks absorb water energy and protect the bank from washing away.
- Which option best protects soil during heavy rain: mulch on soil or soil left uncovered?
- Mulch on soil. Absorbs raindrop impact and slows water runoff.
- Which solution best slows riverbank erosion: rocks along the bank or smooth ice?
- Rocks along the bank (riprap). Heavy rocks absorb water energy and protect the bank.
- Which option best reduces erosion during heavy rain: mulch/ground cover or exposed soil?
- Mulch or ground cover. Mulch absorbs rain impact and slows water flow.
- Which solution best slows water in a garden: a small ditch to guide water or a smooth hard surface?
- A small ditch to guide water. Ditches channel water slowly instead of letting it rush freely.
- Which solution is usually more natural for stopping erosion on a slope: planting shrubs or building a tall wall?
- Planting shrubs. Living plants blend with environment while preventing erosion.
- Which solution best slows water erosion on a steep hill: terraces or removing plants?
- Terraces. Steps slow water flow and catch moving soil.
- Which agent of erosion is most likely when you see sand dunes forming?
- Wind. Wind carries sand particles to form these mounds.
- What is a sand fence used for?
- To slow wind and trap blowing sand. Creates a barrier that catches moving sand particles.
- What is erosion?
- Erosion is the movement of soil or rock by wind or water. Movement happens after weathering breaks rock apart.
- What is terracing?
- Making step-like levels on a slope to slow water. Each level catches water, preventing fast downhill flow.
- Which solution best protects loose soil on a windy day: a fence/windbreak or spraying water once?
- A fence or windbreak. Barriers block wind continuously, unlike temporary water spray.
- Which solution best slows water erosion on a sloped hill: planting grass or removing plants?
- Planting grass. Roots anchor soil and absorb water that would cause runoff.
- Which is better for preventing erosion on a playground slope: planting shrubs or leaving dirt bare?
- Planting shrubs. Shrub roots hold soil while leaves block rain impact.
- Which solution best slows wind erosion in a farm field: a windbreak of trees or bare ground?
- A windbreak of trees. Trees block wind from picking up and moving soil particles.
- What does grass do to help prevent erosion?
- Grass roots hold soil in place. Root systems anchor soil particles together.
- What is a seawall used for?
- To block waves and reduce beach erosion. Protects the shore by absorbing wave energy.