Periglacial Landforms
- Created by: Ali Bland
- Created on: 17-03-15 20:49
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- Periglacial Landforms
- Ice Wedges
- 1) When permafrost contracts in extremely low temperatures,cracks develop
- 2) During the simmer, meltwater flows into these cracks and fills them up
- 3) The meltwater refreezes in the winter to form ice wedges, which expand and force cracks to widen
- Patterened Ground
- As ice wedges become more extensive, a polygonal pattern may be formed on the ground surface
- Solifluction
- The downslope movement of rock and soil material in response to gravity
- Usually occurs in areas where there is a thick and saturated active layer
- Pingos
- Dome-shaped hills which may rise to around 50metres above the landscape
- 1) As sediment gradually freezes during the early winter, the water becomes confined and its pressure increases
- 2) Eventually the trapped water freezes and expands forcing the sediment on top to go upwards
- Ice Wedges
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