What must be present on a rock that undergoes frost wedging?

Question

1.a crack
2.holes around it
3.round shape
4.sharp edges

Answer 1

For frost wedging to occur, the following must be present:

1. A crack - Frost wedging involves the expansion of water that has seeped into cracks in the rock when it freezes. The water expands as it turns into ice, which then exerts pressure on the rock, leading to the breaking apart of the rock. So, a crack is essential for this process to occur.

The other options (holes around it, round shape, sharp edges) are not necessary for the process of frost wedging to take place. Therefore, the correct answer is 1. a crack.