cracks forming in a boulder rocks melting to form magma glaciers forming on a mountainside pebbles combining to form a large rock
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following can be caused by weathering?
Possibilities:
- cracks forming in a boulder
- rocks melting to form magma
- glaciers forming on a mountainside
- pebbles combining to form a large rock

cracks forming in a boulder