You are presented with the question "What can cause rocks to break down?" and the following answer choices: 
- Wind Barriers
 - Protective Barriers
 - Stone Sealers
 - wind
 - mines
 - Water
 - erosion
 - Gravity

Now knowing that mechanical weathering is when rocks are broken down by mechanical means and water is a mechanical weathering force, choose the best answer.


 

      Water   