Ice slides across bedrock/sediment substrate because of a layer of meltwater between the ice and substrate. Water-saturated sediment beneath ice can also slide, carrying the ice with it.
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Explain what is meant by regelation creep.
occurs when ice melts under pressure, usually because it encounters an obstacle. The meltwater flows around the obstacle and refreezes as the pressure drops.
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Explain what is meant by internal deformation.
Movement between or within individual grains of ice, including grains slipping over each other, melting and recrystallising, and slip within individual grains (intra-granular slip).
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Where does basal slip occur?
Warm-based, temperate glaciers and the margins of some cold-based ice masses.
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Where does regelation creep occur?
Valley glaciers on steep, rocky slopes at the ice/substrate contact.
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Where does internal deformation occur?
The upper parts of ice masses. The only type of motion on cold-based ice masses.
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Other cards in this set
Card 2
Front
Explain what is meant by basal slip.
Back
Ice slides across bedrock/sediment substrate because of a layer of meltwater between the ice and substrate. Water-saturated sediment beneath ice can also slide, carrying the ice with it.
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