An ice age is a period of long term low temperatures, around a 4-5 degree drop in global summer temperatures, meaning that ice sheets expand over continent and mountain glaciers form.
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When was the last glacial maximum and what was it called?
18,000 years ago, the Devensian
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Where is ice today?
Canadian Islands, Greenland, Iceland, Svalbard, Norway, Urals, Alps, Kamchatka, Himalayas, Tibetan Plateau, Causcuses, Kilimanjaro, South Island New Zealand, Antarctica, Pyrenees, Andes, Rocky mountains, Cascades and Alaska.
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How does snow become ice?
Snow falls on the glacier- low density then compaction converts it into opaque ice (Neve). Further compaction converts this into glacial ice.
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How long does it take for snow to become ice?
25 years in switzerland but 200 years in Greenland! DEPENDS
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Ice Sheet?
large body of ice over 50,000km2 in extent.
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Ice cap?
body of less than 50,000km2 of ice, found in mountainous regions.
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Valley Glacier?
a finger of ice usually extending downhill from a ice cap and occupying a valley.
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Basal slip?
Melt water in the summer reaches the base of a glacier and allows it to slide over rocks.
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Internal Deformation?
Ice crystals deform and slide past each other allowing the glacier to move.
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Arete?
A knife-edged ridge often formed between two corries.
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Pyramidal peak?
A sharp mountain peak formed when 3 or more aretes form.
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SPEED?
Sequence, Process, Explain, Example, Diagram.
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When was the last glacial maximum and what was it called?
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