Fact 1: Being exposed to wind can cause erosion of soil.

Fact 2: Erosion is the natural wearing away.

Given the two facts above, answer the question "Being exposed to wind can cause the natural wearing away of what?" with the following options: 
- light
 - rocks
 - wind
 - soil
 - water
 - roots
 - cracks
 - earth


 

    soil     