What type of mechanical weathering involves water freezing in cracks, causing expansion and breakage?

Question

Accepted Answer

Ice wedging. Ice wedging, or freeze-thaw weathering, is the main form of mechanical weathering in any climate that regularly cycles above and below the freezing point. Ice wedging works quickly, breaking apart rocks in areas with temperatures that cycle above and below freezing in the day and night, and also that cycle above and below freezing with the seasons.