Best Solution for Land Change - 2nd Grade Science
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Which criterion means a solution can be done with the materials and time available?
Which criterion means a solution can be done with the materials and time available?
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Practical. Practical solutions use resources you already have.
Practical. Practical solutions use resources you already have.
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What does the word criteria mean when you are choosing the best solution?
What does the word criteria mean when you are choosing the best solution?
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Rules or needs used to judge which choice is best. Criteria help you compare options to pick the best one.
Rules or needs used to judge which choice is best. Criteria help you compare options to pick the best one.
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Which solution best meets the goal "stop wind from blowing soil away": plant grass or pour water?
Which solution best meets the goal "stop wind from blowing soil away": plant grass or pour water?
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Plant grass. Grass roots hold soil against wind force.
Plant grass. Grass roots hold soil against wind force.
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Which solution best meets the goal "stop rain from washing soil downhill": build a small wall or remove plants?
Which solution best meets the goal "stop rain from washing soil downhill": build a small wall or remove plants?
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Build a small wall. Walls block water flow and trap soil.
Build a small wall. Walls block water flow and trap soil.
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Which solution best meets "reduce flooding near a stream": add plants along banks or pave the ground?
Which solution best meets "reduce flooding near a stream": add plants along banks or pave the ground?
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Add plants along banks. Plants absorb water and stabilize stream edges.
Add plants along banks. Plants absorb water and stabilize stream edges.
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Which option best meets "least expensive" for stopping erosion: plant seeds or build a concrete wall?
Which option best meets "least expensive" for stopping erosion: plant seeds or build a concrete wall?
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Plant seeds. Seeds cost far less than concrete construction.
Plant seeds. Seeds cost far less than concrete construction.
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Which option best meets "fast to set up today": place sandbags or grow trees?
Which option best meets "fast to set up today": place sandbags or grow trees?
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Place sandbags. Sandbags work immediately; trees take years.
Place sandbags. Sandbags work immediately; trees take years.
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Which option best meets "long-lasting" for holding soil: grow grass or place loose paper on soil?
Which option best meets "long-lasting" for holding soil: grow grass or place loose paper on soil?
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Grow grass. Grass roots create permanent soil stability.
Grow grass. Grass roots create permanent soil stability.
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Which option best meets "protects animals" near a pond: use safe plant barriers or pour chemicals to harden soil?
Which option best meets "protects animals" near a pond: use safe plant barriers or pour chemicals to harden soil?
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Use safe plant barriers. Natural barriers avoid toxic chemical harm.
Use safe plant barriers. Natural barriers avoid toxic chemical harm.
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Which option best meets "uses local materials": build a rock barrier with nearby rocks or order special plastic blocks?
Which option best meets "uses local materials": build a rock barrier with nearby rocks or order special plastic blocks?
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Build a rock barrier with nearby rocks. Local rocks require no shipping or ordering.
Build a rock barrier with nearby rocks. Local rocks require no shipping or ordering.
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Which option best meets "easy for children to do": spread mulch or use heavy machines to dig a trench?
Which option best meets "easy for children to do": spread mulch or use heavy machines to dig a trench?
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Spread mulch. Light mulch is manageable for young students.
Spread mulch. Light mulch is manageable for young students.
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Which solution best meets "stop water from cutting a channel": add plants or remove plant roots from the soil?
Which solution best meets "stop water from cutting a channel": add plants or remove plant roots from the soil?
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Add plants. Plant roots bind soil and slow water flow.
Add plants. Plant roots bind soil and slow water flow.
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Which option is best if the criterion is "easy for students to do"?
Which option is best if the criterion is "easy for students to do"?
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The option with the fewest simple steps. Simple tasks match student abilities better.
The option with the fewest simple steps. Simple tasks match student abilities better.
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Which option is best if the criterion is "uses materials found nearby"?
Which option is best if the criterion is "uses materials found nearby"?
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The option using local materials. Nearby materials save transport time and cost.
The option using local materials. Nearby materials save transport time and cost.
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Which criterion is most important if a solution should not harm plants and animals?
Which criterion is most important if a solution should not harm plants and animals?
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Protects living things (is environmentally safe). Choose options that don't damage ecosystems.
Protects living things (is environmentally safe). Choose options that don't damage ecosystems.
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