If freezing and thawing can break down rocks from larger whole into smaller pieces, then what can can break down rocks from larger wholes into smaller pieces?

Answer choices:
- Earthworms
 - sea urchins
 - Freezing and thawing
 - Calcium carbonate
 - Compaction
 - mechanical
 - Sedimentation
 - Cementation

 

   Freezing and thawing       