- 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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