You are presented with the quiz "What is created from cycles of freezing and thawing water?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cycles of freezing and thawing water cause ice wedging" and "under the pressure of the innumerable wedges of ice, the rock cracks". 

So, what's the best answer to the question?


 

   Something that cracks rocks        