Ice On Land

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  • Created by: Harry
  • Created on: 09-05-14 21:46
What are the causes of avalanches?
Heavy snowfall, steep slopes, tree removal, heavy rainfall and human factors (erosion, off-piste skiing)
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What can we do to combat avalanches?
Trigger small avalanches under controlled conditions, controlling avalanche activity -> stabilising the snowpack in the starting zone -> prevents snowpack from gaining momentum
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What is a nunatak?
A mountainous area that sticks out above the ice sheet
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What is a glacier?
A small scale tongue of ice in upland areas
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What is the common rule for the glacier budget?
If accumulation exceeds ablation, the glacier will advance. If ablation exceeds accumulation, the glacier retreats.
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Explain the formation of a corrie (part 1).
1) North facing slope accumulates in the N. Hemisphere 2) Need snow all year round 3) More chance of it staying in a crack (aka. nirvation hollow) 4) Snow turns to firn/neve to ice over 20 years
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Explain the formation of a corrie (part 2).
1) A crevasse at the back of the corrie (bergschrund) allows daytime melting to occur 2) Meltwater flows down back of bergschrund and under glacier 3) FTW and plucking occurs (9% expansion + pressure) -> Angular scree
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Explain the formation of a corrie (part 3).
4) Scree is used as a tool of abrasion and produces an over deepening 5) Rotational movement occurs -> Ice flows along curve, over-deepens a hollow and rises to form a corrie lip.
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Describe a pyramidal peak
3/4 sides made up of a corrie or aretes.
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Describe a glacial trough
A U shaped valley, wide and deep, steep sided and a flat valley bottom
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Describe a hanging valley
A small valley that feeds into the main valley and his left hanging up above the main one. It is formed where a small tributary glacier is with the exception of ice, producing a hanging valley and waterfall
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Describe a truncated spur
An unusually steep piece of land that is formed as a result of the initial interlocking spur
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Describe a drumlin
A mound/hill of glacial till that is deposited by ice. It has a sleep and a gentle slop and a collection of drumlins is what's known as a drumlin swarm. They are about 100-150m long and 20-100m high.
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Other cards in this set

Card 2

Front

What can we do to combat avalanches?

Back

Trigger small avalanches under controlled conditions, controlling avalanche activity -> stabilising the snowpack in the starting zone -> prevents snowpack from gaining momentum

Card 3

Front

What is a nunatak?

Back

Preview of the front of card 3

Card 4

Front

What is a glacier?

Back

Preview of the front of card 4

Card 5

Front

What is the common rule for the glacier budget?

Back

Preview of the front of card 5
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