Plants slow the runoff of water and soil. Plant roots grow in rocks, breaking the rocks. Plant roots hold the soil in place against wind. Plants break the impact of raindrops before they hit the soil.
I gave my students this multiple choice question: Plants can help prevent erosion or contribute to erosion. Which describes how plants could contribute to erosion?

Only one answer is correct among these 4 choices:
- Plants slow the runoff of water and soil.
- Plant roots grow in rocks, breaking the rocks.
- Plant roots hold the soil in place against wind.
- Plants break the impact of raindrops before they hit the soil.

Could you tell me which one is correct?

Plant roots grow in rocks, breaking the rocks.