Landforms Created by Glaciers Aim: To describe and explain how erosion by glaciers create Corries, Arêtes, and Pyramidal Peaks. Starter: Complete the worksheet by writing in the definitions then trying to work out what the glacial features are. Arete: An arête is a knife-edge ridge. It is formed when two neighbouring corries run back to back. Corrie: A corrie is a rounded, armchair shaped hollow with a steep back wall on the side of a mountain. Pyramidal Peak: A pyramidal peak is formed where three or more corries and Arêtes meet. It is the point at the top of a mountain.
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Landforms Created by Glaciers Aim: To describe and explain how erosion by glaciers create Corries, Arêtes, and Pyramidal Peaks. Starter: Complete the worksheet.
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Landforms Created by GlaciersAim: To describe and explain how erosion
by glaciers create Corries, Arêtes, and Pyramidal Peaks.
Starter: Complete the worksheet by writing in the definitions then trying to work out what the glacial features are.
Arete: An arête is a knife-edge ridge. It is formed when two neighbouring corries run back to back. Corrie: A corrie is a rounded, armchair shaped hollow with a steep back wall on the side of a mountain.Pyramidal Peak: A pyramidal peak is formed where three or more corries and Arêtes meet. It is the point at the top of a mountain.Tarn: Is a lake found in the bottom of a corrie.
Before Glaciation – V shaped valleys, rounded hills
During Glaciation – Glacial processes begin to change the shape of the landscape
After Glaciation – U shaped valleys, steep sided mountains.
How is a Corrie formed?Snow collects in a natural hollow on the side of a mountain. Over time, further snow collects in the hollow. This extra weight compresses the snow underneath, turning it into ice.
The hollow is deepened and widened by the corrie glacier through the processes of abrasion and plucking.
This over-deepening leads to an ‘armchair’ shape characteristic of a corrie and causes a ‘rock lip’ to be formed.
Explain how is a Corrie formed (4)
Use the information in the video and the information provided to help you annotate the formation of a corrie.
As snow gathers and piles up the pressure forms ice and it starts to move downhill
The process of plucking steepens the back of the corrie.
Ice rotates, scooping out the floor of the corrie
Water may gather on the floor of the corrie. This is know as a tarn