Pressure from the overlying mass of ice causes freeze thaw action. Melting water fills the cracks or joints in the bed rock. As water freezes it exerts pressure on the cracks enlarging them. The enlarged cracks lead to disintegration of the rock. The rock debris are scoured or pulled off the mother rock by the moving ice. The disintegrated rocks eventually get embedded within the mass of ice. As the ice moves, it pulls out the embedded rock from the mother rock. This process is called plucking.
maurice.mutuku answered the question on June 8, 2017 at 13:24
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