You are presented with the question "What is the most important part of mechanical weathering?" and the following answer choices: 
- roots and shoots
 - when they liquify
 - roots to grow
 - when it melds into soil
 - volcanic rock cracking
 - a tree falling
 - the looseness of soil
 - ice causes rocks to crack

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.


 

        ice causes rocks to crack 