Best Solution for Land Change - 2nd Grade Science

Which criterion is most important if a solution must last through many storms?

Durability (lasts a long time). Strong solutions withstand weather over time.
Which option best meets "protects animals" near a pond: use safe plant barriers or pour chemicals to harden soil?

Use safe plant barriers. Natural barriers avoid toxic chemical harm.
Identify the best solution for a muddy path at school: add gravel or pour cooking oil on it.

Add gravel. Gravel provides stable walking surface; oil makes paths slippery.
Which option is best if the criterion is "easy for students to do"?

The option with the fewest simple steps. Simple tasks match student abilities better.
Which option best reduces flooding in a neighborhood: adding plants/rain gardens or paving more ground?

Adding plants or rain gardens. Plants absorb water, while pavement increases runoff.
Which option best reduces wind erosion in a sandy area: planting grass or pouring water once?

Planting grass. Grass roots hold sand in place permanently; water evaporates quickly.
Which solution best meets the goal "stop rain from washing soil downhill": build a small wall or remove plants?

Build a small wall. Walls block water flow and trap soil.
Which solution best meets "reduce flooding near a stream": add plants along banks or pave the ground?

Add plants along banks. Plants absorb water and stabilize stream edges.
Which option best protects a stream from muddy water: leaving plants by the stream or removing them?

Leaving plants by the stream. Plants filter sediment before it reaches the water.
Which option is best if the criterion is "uses materials found nearby"?

The option using local materials. Nearby materials save transport time and cost.
Which option best protects soil during heavy rain: covering soil with mulch or removing all plants?

Covering soil with mulch. Mulch absorbs rain impact; bare soil erodes easily.
Which solution best meets the goal "stop wind from blowing soil away": plant grass or pour water?

Plant grass. Grass roots hold soil against wind force.
What does solution mean when discussing how to fix a land-change problem?

A way to solve a problem or meet a need. Solutions address specific problems with practical actions.
Which criterion means a solution will not harm plants, animals, or people?

Safe for living things. This ensures no damage to the environment or organisms.
Identify the best choice if the main criterion is 'protect animal homes': build away from nests or clear the area.

Build away from nests. Building elsewhere preserves wildlife habitats.
Which criterion means a solution can be done with the materials and time available?

Practical. Practical solutions use resources you already have.
Which solution best matches the criterion 'safe for living things': planting native plants or dumping oil on soil?

Planting native plants. Native plants support ecosystems, oil harms all life.
Which option best meets the criterion 'reduce erosion and keep water clean': plant a buffer strip or pour concrete into soil?

Plant a buffer strip. Buffer strips filter runoff, concrete harms soil.
Which solution best meets the criterion 'long-term': planting trees or spraying water once?

Planting trees. Trees provide decades of protection; one-time water evaporates.
Which option best fits the criterion "fastest to use"?

The option that takes the least time to do. Speed matters when you need quick results.
Which option best meets the criterion 'protect water quality': planting plants by a stream or dumping dirt into it?

Planting plants by a stream. Plants filter runoff; dumping dirt pollutes water.
Which option best meets the cost criterion: using free fallen leaves as mulch or buying stone blocks?

Using free fallen leaves as mulch. Free materials cost nothing; purchased items require money.
Which criterion matters most if the goal is to stop soil from washing away?

Prevents erosion (keeps soil in place). Erosion moves soil away, so preventing it is key.
Which option best reduces erosion on a bare hillside: planting grass or painting the soil?

Planting grass. Grass roots hold soil together, while paint doesn't help.
Which solution best meets "stop water from cutting a channel": add plants or remove plant roots from the soil?

Add plants. Plant roots bind soil and slow water flow.
Which criterion is most important if a solution should not harm plants and animals?

Protects living things (is environmentally safe). Choose options that don't damage ecosystems.
What does the word criteria mean when you are choosing the best solution?

Rules or needs used to judge which choice is best. Criteria help you compare options to pick the best one.
Which option best keeps soil in place during heavy rain: mulch/ground cover or leaving soil bare?

Mulch or ground cover. Mulch protects soil from rain impact and erosion.
Which option best protects a riverbank from erosion: planting trees or removing all plants?

Planting trees. Tree roots stabilize soil and absorb water near rivers.
Which option best slows runoff on a steep slope: terraces or making the slope smoother with sand?

Terraces. Terraces create steps that slow water flow down slopes.
Which solution best keeps sand from moving on a windy beach: planting beach grass or raking the sand daily?

Planting beach grass. Beach grass roots anchor sand, raking doesn't prevent movement.
Which solution best matches the criterion 'low cost': using local rocks or buying a large machine?

Using local rocks. Local materials cost less than expensive equipment.
Which option best meets "fast to set up today": place sandbags or grow trees?

Place sandbags. Sandbags work immediately; trees take years.
Which option best meets "long-lasting" for holding soil: grow grass or place loose paper on soil?

Grow grass. Grass roots create permanent soil stability.
What criterion means a solution can be done with available materials and time?

Practicality. Solutions must be doable with what you have.
Which solution is safest near a playground: planting grass or building a tall concrete wall?

Planting grass. Grass is soft and safe; walls can injure children.
Which option best reduces water erosion on a hill: planting shrubs or leaving bare soil?

Planting shrubs. Shrub roots grip soil and slow water flow on slopes.
What criterion means a solution does not harm plants, animals, or people?

Safety. Solutions must protect living things from harm.
Which criterion means a solution stops soil from being carried away by water?

Prevents erosion. Erosion prevention keeps soil in place during rain or wind.
Which solution is more durable for stopping a stream bank from crumbling: rocks or paper towels?

Rocks. Rocks last for years; paper dissolves in water.
Which option best fits the criterion "least expensive"?

The option that costs the least money. Compare prices to find the cheapest option.
Which solution best matches the criterion 'lasting': growing deep-rooted plants or putting up a paper wall?

Growing deep-rooted plants. Deep roots last years, paper breaks down quickly.
Which option best meets the criterion 'quick to do today': putting down straw or growing a forest?

Putting down straw. Straw takes minutes to spread; forests take years to grow.
Which option best meets "easy for children to do": spread mulch or use heavy machines to dig a trench?

Spread mulch. Light mulch is manageable for young students.
Which option best meets the criterion 'uses local materials': using nearby rocks or ordering special metal parts?

Using nearby rocks. Local materials are already available; special parts need ordering.
Which criterion is most important if people could get hurt by a land-change solution?

Safety. Protecting people from harm comes first.
What does the word solution mean in a land-change problem?

A way to fix or improve the problem. Solutions address problems by making improvements.
Which solution best matches the criterion 'fast to do today': placing sandbags or growing trees?

Placing sandbags. Sandbags work immediately, trees take years to grow.
What is a criterion you can use to choose the best solution for stopping erosion?

How well it prevents soil from washing or blowing away. Effective erosion control must stop soil movement by wind or water.
Which solution best fits the criterion 'does not block animal movement': a fence or planting native plants?

Planting native plants. Plants allow animals to pass through; fences block movement.
Which option best meets "least expensive" for stopping erosion: plant seeds or build a concrete wall?

Plant seeds. Seeds cost far less than concrete construction.
Which option best meets "uses local materials": build a rock barrier with nearby rocks or order special plastic blocks?

Build a rock barrier with nearby rocks. Local rocks require no shipping or ordering.
Which solution best prevents landslides on a steep hill: planting deep-rooted plants or adding loose sand?

Planting deep-rooted plants. Deep roots anchor soil firmly; sand makes slopes unstable.
What does the word criteria mean when choosing the best solution to a problem?

Rules or things you look for to decide what is best. Criteria are standards used to judge which option works best.
Which criterion means a solution works for a long time, not just one day?

Lasting (long-term). Long-term solutions continue working without frequent repairs.
What criterion means a solution will last a long time without breaking?

Durability. Solutions should withstand weather and time.
Which solution is most practical for a small school garden: adding mulch or building a dam?

Adding mulch. Mulch is simple to spread; dams require major construction.
Which option best slows running water on a slope: making terraces or making the slope smoother?

Making terraces. Terraces create steps that slow water; smooth slopes increase speed.
Which option best prevents wind from blowing soil away: a windbreak of trees or cutting down trees?

A windbreak of trees. Trees block wind, while cutting them exposes soil.

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