You are presented with the question "what do cycles of freezing and thawing water cause?" and the following answer choices: 
- Metling snow
 - water vapor
 - the looseness of soil
 - mechanical weathering
 - freezing oxygen
 - fissures of hot, acidic water
 - looseness of dirt or compost
 - explosions

Now knowing that cycles of freezing and thawing water cause ice wedging and ice wedging is the most important form of mechanical weathering, choose the best answer.


 

    mechanical weathering     