Fact 1: Cycles of freezing and thawing water cause ice wedging.

Fact 2: Ice wedging is the most important form of mechanical weathering.

Given the two facts above, answer the question "Freezing and thawing cause what type of weathering?" with the following options: 
- loose soil
 - climate
 - mechanical
 - flooding
 - Sediment
 - rivers
 - Metling snow
 - Winter


 

   mechanical      