Flashcards
Cold Environments - Landforms
Cards in this deck (17)
- 1Corrie/CWM/CirqueLarge steep back wall in an arm chair shape created by plucking
Formation:
1) Located on north facing slopes where accumulation is highest
2) Hollow is filled with snow and nivation causes it to deepen
3) Snow becomes thicker, and compresses into ice
4) Rotational movement of the ice with debris causes the back wall and floor to abrade
5) Water runs down the crevasse to cause freeze-thaw action
6) Reduced erosion at the front of the corrie means a lip forms - 2AreteWhere two corries meet back to back
- 3Pyramid PeakWhere three corries meet back to back
- 4U-shaped ValleyFlat floor valley, steep valley sides
- 5Glacial Trough1) Main valley widened and deepened by ice
2) The main valley is now much deeper and the tributary valley is high above main valley - 6Roche MoutonneeUpvalley - Smooth, rounded rock on the upvalley created by abrasion. Striations may be left.
Lee/downvalley - Plucking causes this side to be jagged and steep - 7TillUnsorted glacial sediment, e.g sand, gravel
Was carried either as englacial, supra-glacial or sub-glacial
Lodgement Till - Subgalcial material carried by the glacier
Ablation Till - Produced at snout of glacier when ice melts - 8Moraine1) Lateral - Debris at the side of the glacier
2) Medial - Debris formed in the middle of a glacier
3) Terminal - Debris found at the extent of the glacier
4) Recessional - Marks retreat of the glacier
5) Push - Marks where the former moraine was pushed forward if there has been a glacier re-advance - 9ErraticsRocks that have been picked up by a glacier and deposited in an area of different geology
- 10DrumlinsSmooth elongated mound of lodgement till that are up to 1.5km long and 50-60m high
Formed when the ice became overloaded with sediment and deposited - 11Fluvioglacial LandformsFormed by meltwater and found in lowland ares
- 12Outwash PlainLayer of sand, gravel and clay formed in front of where the snout of the glacier would have been
Deposited by meltwater streams - 13Kettle HolesSeries of small depressions often filled with lakes or marsh land on the outwash plain
1) Large blocks of ice left as the glacier retreats on the outwash plain
2) Meltwater streams deposit gravel and sand around the ice.
3) Over time, temperatures rise so the ice melts and depressions are left - 14EskersLong sinuous ridges of sand and gravel material about 5-20m high
Run in same direction of ice advance of the glacier - 15Kames
- 16Pro-Glacial Lakes
- 17Varves
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- AS - Level Geography (Cold Environments) Flashcards on Cold Environments - Landforms, created by Joshua Smith on 11/05/2016.
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- Joshua Smith
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