You are presented with the question "What is the breaking down of whole rocks into smaller pieces?" and the following answer choices: 
- cracking
 - compression
 - rock crumbling
 - loose soil
 - cleavage
 - flooding
 - eroding
 - mechanical

Now knowing that weathering means breaking down rocks from larger whole into smaller pieces by weather and through weathering, the surface was eroded away, exposing igneous rock, choose the best answer.


 

       eroding  