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Glacial landforms
Plucking occurs when rocks and stones become frozen to the base or sides of the glacier and are plucked from the ground or rock face as the glacier moves.
This leaves behind a jagged landscape. Abrasion occurs when rocks and stones become embedded in the base and sides of the glacier.
Plucked debris from the back wall causes further erosion through abrasion which deepens the corrie.
Some of this debris is deposited at the edge of the corrie, building up the lip.
Moraines are accumulations of dirt and rocks that have fallen onto the glacier surface or have been pushed along by the glacier as it moves
Why Rotation?
Even though the ice is trapped in a hollow and unable to move down hill, gravity will still encourage it to move. This circular motion is known as rotational slip and can cause the ice to pull away from the back wall creating a crevasse.
2) Arete
4)Tarn
5) U shaped valley
Just as a river could be seen as a system of inputs, outputs, transfers and storage, so can a glacier. Whether a glacier grows or retreats is directly affected by the comparison between the inputs and outputs
task: using the information in your tables draw a labelled sketch of how you think a U shaped valley is formed.
An arête is a knife-edge ridge. It is formed when two neighbouring corries run back to back. As each glacier erodes either side of the ridge, the edge becomes steeper and the ridge becomes narrower.
Corries/Cirques
1)
Step 1
Water enters cracks in the rock, when temperatures drop below zero the water freezes and expands putting pressure on the surrounding rock. When temperatures rise again the water melts. This process weakens the rock.
When ice in a corrie melts, a circular lake is often formed at the bottom of the hollow. This is known as a tarn.
A U-shaped valley or glacial trough is formed by the process of glaciation. It has a characteristic U shape, with steep, straight sides and a flat bottom. Glaciated valleys are formed when a glacier travels across and down a slope, carving the valley