frost pull and frost push Periglacial processes that bring about the upward migration of clasts through the regolith. Frost push takes place when an ice lens forms beneath a clast and so pushes it upwards. Frost pull occurs when a clast adheres to ice within a freezing regolith and so is drawn upwards as the ground heaves.

frost pull and frost push Periglacial processes that bring about the upward migration of rock fragments (clasts) through the regolith. Frost push takes place when an ice lens forms beneath a clast and so pushes it upwards. Frost pull occurs when a clast adheres to ice within a freezing regolith and so is drawn upwards as the ground heaves.