In areas where freezing and thawing occur frequently, rocks weather rapidly because of the of freezing water.

The correct answer is expansions. What happens is that rain falls down and the water fills the cracks of rocks. When it freezes, it expands and this breaks the rock. When it melts, the hole is bigger and the next time rain falls, there's more of it, and it freezes again, and so on and so forth until the rock breaks down completely. This is how caves in the ground and cliffs are made.