Ice Movement (AQA A-Level Geography): Flashcards
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10 cards from this deck
Force driving ice movement downhill
Force driving ice movement downhill
Gravity
Two zones within a glacier
Two zones within a glacier
Upper rigid zone (brittle) & lower plastic zone (flows)
Internal deformation (creep) definition
Internal deformation (creep) definition
Stress builds up, ice behaves with plasticity & flows
Where rotational flow occurs
Where rotational flow occurs
Within the corrie (cirque)
When compressional flow occurs
When compressional flow occurs
Where gradient reduces, ice slows & thickens
Effect of compressional flow
Effect of compressional flow
Ice erosion reaches maximum intensity
When extensional flow occurs
When extensional flow occurs
Where gradient steepens, ice accelerates & thins
Role of meltwater in basal sliding
Role of meltwater in basal sliding
Acts as lubricant, enables faster flow over bedrock
Speed of glacial surges
Speed of glacial surges
250-300 metres in one day
Where ice moves fastest in a glacier
Where ice moves fastest in a glacier
Centre surface (less friction than edges/base)