Glacial Ice Formation (Leaving Cert Geography): Flashcards
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Practise the cards
11 cards from this deck
Definition of glaciation
Definition of glaciation
Spread of large masses of ice over land and sea
What are glaciers?
What are glaciers?
Rivers of ice that move slowly
Forces moving glaciers downslope
Forces moving glaciers downslope
Gravity and pressure of their own weight
Glacier formation condition
Glacier formation condition
Accumulation of snow/ice > melting rate
What is Basal Sliding?
What is Basal Sliding?
Ice slips downslope using meltwater as lubricant
Cause of friction in Basal Sliding
Cause of friction in Basal Sliding
Weight of ice against bedrock
Result of friction in Basal Sliding
Result of friction in Basal Sliding
Heat, forming layer of meltwater
Meltwater role in Basal Sliding
Meltwater role in Basal Sliding
Acts as lubricant for ice to slip
What is Plastic Flow?
What is Plastic Flow?
Ice crystals bend, flow & creep over uneven rock
Plastic Flow speed comparison
Plastic Flow speed comparison
Much slower than Basal Sliding
Two types of glacier ice movement
Two types of glacier ice movement
Basal Sliding and Plastic Flow