the rotation of Earth the growth of animals the decay of large trees the weathering of rocks
I gave my students this multiple choice question: Sand is a type of soil that is made of very tiny pieces of material. Which process most likely forms sand?

Only one answer is correct among these 4 choices:
- the rotation of Earth
- the growth of animals
- the decay of large trees
- the weathering of rocks

Could you tell me which one is correct?

the weathering of rocks