melting inside of Earth weathering by wind and water cementing by mud and minerals being pressed between layers of soil
I gave my students this multiple choice question: Which action most likely causes large rocks to become smaller pieces of rock?

Only one answer is correct among these 4 choices:
- melting inside of Earth
- weathering by wind and water
- cementing by mud and minerals
- being pressed between layers of soil

Could you tell me which one is correct?

weathering by wind and water