Glacial Ice Formation (Leaving Cert Geography): Flashcards
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Practise the cards
12 cards from this deck
Glaciation definition
Glaciation definition
Spread of large masses of ice over land and sea
Glaciers definition
Glaciers definition
Rivers of ice that move slowly
Forces making glaciers move downslope
Forces making glaciers move downslope
Gravity & pressure of ice's own weight
Condition for glacier formation
Condition for glacier formation
Accumulation of snow/ice > rate of melting
Basal sliding
Basal sliding
Ice movement when meltwater lubricates glacier base
What causes friction in basal sliding
What causes friction in basal sliding
Weight of ice on bedrock beneath
What friction produces in basal sliding
What friction produces in basal sliding
Heat, forming a layer of meltwater
Role of meltwater in basal sliding
Role of meltwater in basal sliding
Acts as lubricant, allowing ice to slip downslope
Plastic flow
Plastic flow
Ice particles bend & flow over uneven rock surfaces
How ice crystals move in plastic flow
How ice crystals move in plastic flow
Creep past each other
Speed of plastic flow vs basal sliding
Speed of plastic flow vs basal sliding
Much slower than basal sliding
Two types of glacier movement
Two types of glacier movement
Basal sliding and plastic flow