You are presented with the question "What does mechanical weathering do to a rock?" and the following answer choices: 
- move to different locations
 - Causes it to crack
 - Makes it shrink
 - break off
 - Regrows it
 - decreases its bodily water
 - Moves it
 - Causes it to grow

Now knowing that ice wedging is when ice causes rocks to crack by expanding in openings and ice wedging is the most important form of mechanical weathering, choose the best answer.


 

  Causes it to crack       