Glacial landforms
- Created by: Elliebb2014
- Created on: 12-03-17 15:39
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- Glacial landforms
- Erosional
- Corrie
- Armchair shaped hollow, found on upland hills, steep back wall and over deepened basin and lip at the front
- Aretes
- narrow, steep sided ridge between two corries
- Pyramidal peak
- Where three corries develop around a hill and retreat to form a three sided pointy peak
- Trough
- Glaciers flow down pre-existing river valleys, as they move they erode the sides causing the shape to become deeper wider and straighter.
- Valley is deepened when compressing flow occurs forming rock basins and rock steps
- More evident when there are alternating bands of rock
- Roche moutonnée
- Resistant rocks are sometimes found on the floor of glacial troughs, as ice advances there is localised pressure melting, pressure is reduced and meltwater refreezes resulting in plucking snd steepening
- smoothed by abrasion
- Striations
- scratches made by debris embedded in base of the glacier
- Found on roche moutonnées
- Ellipsoidal basins
- created by ice sheets,
- Weight of Laurentide ice sheet lead to isostatic lowering of the surface landscape
- Corrie
- Depositional
- Morraine
- Terminal
- ridge of till extending across a glacial trough, marks position of maximum advance
- Recessional
- series of ridges running transversely along glacial troughs, parallel to terminal morraine, form during temporary stand still in retreat
- Lateral
- ridge of till running along a glacial valley, material accumulates on top the glacier, as the glacier melts or retreats this material sinks through the ice and is deposited
- Terminal
- Erratic
- Individual piece of rock, composed of different geology to area they have been deposited, eroded by plucking or added to supraglacial debris by weathering and rockfall
- Drumlins
- mound of glacial debris which has been streamlined into an elongated hill, per shaped and face direction of ice flow, the stoss faces the ice flow. Abrasion causes the stoss side to erode.
- Till sheets
- Formed when a large mass of unstratified drift is deposited at the end of a period of ice sheet advance.
- Morraine
- Erosional
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