cycles of freezing and thawing water cause ice wedging
freezing is not cooling_process. snow_and_ice is not both_forms_of_frozen_water. snowing is precipitation_process. thaw is phase_change. frost is ice. thaw is not heating. freezing is cooling_process. snow_and_ice is both_forms_of_frozen_water. if ice_up occurs then freeze occurs. thaw is heating.