Formation of a corrie

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  • Formation of a corrie
    • A corrie is a arm chair shape hollow with a steep back wall
    • When two corries lie back to back they leave an arête, an example is mount blanc
    • If more than two develop on a mountain the mass will form as a pyramidal peak.
    • The original process is nivation which deepens a preglacial hollow.
    • as the hollow grows and snow becomes thicker and turns into a firn and then ice
    • The back wall becomes steeper from plucking.
    • The rotational movement of ice abrades the floor of the hollow
    • As the hollow deepens the thinner ice at the edge doesn't produce the same amount of downcutting.
      • A rock lip is developed


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