You are presented with the quiz "What is common in high cold latitudes that can force soil particles together?" 

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 "ice wedges, which are common in high, cold latitudes, can force soil particles together". 

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


 

        freezing and thawing water   