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

Question

A Crack
Round shape
Holes around it
Sharp edges

Answer 1

For a rock to undergo frost wedging, a crack must be present. Frost wedging occurs when water seeps into the cracks of rocks, freezes, and expands, causing the cracks to widen and potentially break the rock apart. The other options (round shape, holes around it, sharp edges) are not necessary for frost wedging to occur.