You are presented with the question "What causes ice wedging?" and the following answer choices: 
- Metling snow
 - Condensation
 - The sun
 - friction
 - Gravitational pull
 - mechanical
 - Weathering
 - Animals

Now knowing that cycles of freezing and thawing water cause ice wedging and the processes of weathering, and water or ice wedging may assist in this, choose the best answer.


 

       Weathering  