sand blowing into cracks leaves pressing down tightly ice breaking large rocks apart shells and bones sticking together
I gave my students this multiple choice question: A student climbs up a rocky mountain trail in Maine. She sees many small pieces of rock on the path. Which action most likely made the small pieces of rock?

Only one answer is correct among these 4 choices:
- sand blowing into cracks
- leaves pressing down tightly
- ice breaking large rocks apart
- shells and bones sticking together

Could you tell me which one is correct?

ice breaking large rocks apart