Fact 1: Weathering means breaking down rocks from larger whole into smaller pieces by weather.

Fact 2: Through weathering, the surface was eroded away, exposing igneous rock.

Given the two facts above, answer the question "What is the breaking down of whole rocks into smaller pieces?" with the following options: 
- cracking
 - compression
 - rock crumbling
 - loose soil
 - cleavage
 - flooding
 - eroding
 - mechanical


 

       eroding  