Plant leaves insulate surrounding rocks from extreme temperatures. Plant roots grow into cracks in rocks. Seeds from plants fall onto rocks and release acidic compounds. Stems of plants surround and squeeze rocks.
I gave my students this multiple choice question: How do plants most commonly break large rocks into smaller pieces?

Only one answer is correct among these 4 choices:
- Plant leaves insulate surrounding rocks from extreme temperatures.
- Plant roots grow into cracks in rocks.
- Seeds from plants fall onto rocks and release acidic compounds.
- Stems of plants surround and squeeze rocks.

Could you tell me which one is correct?

Plant roots grow into cracks in rocks.