Periglacial geomorphology

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  • Created by: Annal22
  • Created on: 15-05-17 17:10
What are the main types of ground ice?
Soil ice, vein ice, intrusive ice and buried ice.
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Why are non-sorted circles unvegetated in the centre?
Because of frost heave, roots cannot survive the constant movement of sediment.
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Examples of thermokarst include....
Thaw slumps, thaw lakes, alases.
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Thermokarst can affect topography of an area because of...
30% decrease in volume as ice melts, water run-off causes sediment movement away from site.
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Patterned ground occurs because of....
differential frost heave.
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Which periglacial landform experiences cryoturbation?
Earth hummocks
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'Ground which has been permanently frozen for at least 2 years'.
Permafrost
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The gaps of unfrozen ground within discontinuous permafrost are known as ....
talik
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Periglacial landforms depend on....
moisture, temperature and seasonality
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Which feature is always associated with peat in either bogs or myres?
Palsas
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How are palsas formed?
Differential freezing --> Expansion of ground (30% increase in volume) --> Ice core formed of segregated ice --> Development of different vegetation across the dome
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The 'slip plane' is...
the very slippery slope on which super saturated sediment can move, causing mass movement.
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In which season is gelifluction most likely to occur?
spring
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Why is the process of water entering a crack in rock, freezing, and forcing the rock apart not wholly supported?
Rock is relatively much stronger than ice.
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What is the difference between a lobate and tongue rockglacier?
A lobate rockglacier has a greater width than length, when a tongue rockglacier has the inverse.
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At what rate do frozen coasts erode?
30-40m/yr
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Thermal erosion is when....
relatively warmer water thaws and undercuts permafrost.
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'A sloping mass of rock fragments generally found at the bottom of a steep slope.'
talus
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Other cards in this set

Card 2

Front

Why are non-sorted circles unvegetated in the centre?

Back

Because of frost heave, roots cannot survive the constant movement of sediment.

Card 3

Front

Examples of thermokarst include....

Back

Preview of the front of card 3

Card 4

Front

Thermokarst can affect topography of an area because of...

Back

Preview of the front of card 4

Card 5

Front

Patterned ground occurs because of....

Back

Preview of the front of card 5
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