Weathering processes in glacial environments

Weathering processes in glacial environments

1. Frost shattering

   • Occurs when temperatures fluctuate, rising during day but dropping below freezing at night
     • Water enters cracks in rocks and freezes overnight - expanding by volume of 10% exerting pressure on crack
       • As this process continues, cracks widen and eventually pieces of rock break off. Weathering process important as helps produce some of debris used in abrasion.

2. Dilation

   • When overlying pressure is released, such as when a glacier begins to melt and loses weight, underlying rock expands (Dilates) and fractures; joints created and existing joints in rock are enlarged. This enables glacial erosion to be more effective.