Rocks form deep underground. Rocks become smooth and round. Rocks are broken apart into small pieces. Rocks are moved from one place to another.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Erosion and weathering can both cause changes to the surface of Earth. Which of the following happens only because of erosion and NOT because of weathering?
Possibilities:
- Rocks form deep underground.
- Rocks become smooth and round.
- Rocks are broken apart into small pieces.
- Rocks are moved from one place to another.

Rocks are moved from one place to another.