Ice on the Land

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What is the name of the last ice age?
Pleistocene
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How long ago did the last glacial period end?
20,000 years ago
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How much of the earths's land surface is currently covered by ice?
Approximately 10%
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What 3 types of evidence are used to identify past temperature changes?
Chemical, Geological and Fossil evidence
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Define the term accumulation
Accumulation is the input of snow and ice into the glacier
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What is the zone of ablation?
The lower part of the glacier
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Give an example of a retreating glacier
Rhone glacier
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What evidence is there that a glacier is retreating?
Pictures, Monitoring data and amount of meltwater
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Explain freeze-thaw weathering
Freeze-thaw weathering is where water gets into cracks in rocks. The water freezes and expands, putting pressure on the rock. The ice then thaws/melts, releasing the pressure. When this process is repeated, bits of rock can fall off.
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What is a corrie?
A corrie is a steep sided, armchair shaped hollow with a lip at the bottom. It often leaves a small circular lake called a tarn.
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How is a pyramidal peak formed?
A pyramidal peak is a pointed mountain peak with at least three sides. It is formed when three or more back to back glaciers erode a mountain.
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Describe what a drumlin looks like
Drumlins are elongated hills of glacial deposits. They are round, blunt and steep at the upstream end. They are tapered, pointed and gently sloping at the downstream end.
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What are the four main types of moraine?
Terminal, medial, lateral and ground
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Name a case study for tourism on ice
Chamonix
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Why do people visit Chamonix?
Many people visit for winter sports and sightseeing. In Chamonix there are lots of glaciers which people can go visit, for example Mer de Glsce. There are also many tourist attractions such as ski resorts, hiking trails and mountain bike tracks etc.
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How is tourism here managed?
Chamonix valley needs to be conserved. Some strategies include: use of avalanche barriers to maintain resorts. Free public transport to reduce the amount of traffic and pollution and hotels reduce the amount of energy use to reduce CO2 emissions.
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Name an industry affected by glacial retreat
Glacial retreat affects tourism as there will be no ice for winter sports and also snowfall will be unreliable. This is bad as tourism is a big source of money and businesses will make less as a result of less tourism.
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Card 2

Front

How long ago did the last glacial period end?

Back

20,000 years ago

Card 3

Front

How much of the earths's land surface is currently covered by ice?

Back

Preview of the front of card 3

Card 4

Front

What 3 types of evidence are used to identify past temperature changes?

Back

Preview of the front of card 4

Card 5

Front

Define the term accumulation

Back

Preview of the front of card 5
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