Marcie’s family takes a trip to the beach. They observe many features along the shoreline, including sea stacks and sea arches. These features are made of granite, a very hard rock. It takes many years and a huge amount of wave energy for a sea arch to fall, forming a sea stack. The sea arch illustration on the left is an arch made of rock, while the sea stack illustration on the right is two columns of rock with a space in between.

Which step of the rock cycle happens as the sea stacks are broken down?

A. deposition
B. pressure changes
C. temperature changes