You are presented with the question "What is the rate of ice wedging?" and the following answer choices: 
- In the winter
 - erosion
 - mechanical
 - Physical weathering
 - Dilution
 - friction
 - it fluctuates
 - kinetic

Now knowing that cycles of freezing and thawing water cause ice wedging and the fact is that ice seldom freezes or thaws at a uniform rate, choose the best answer.


 

       it fluctuates  