How do corries formed

Wicklow, Coomshingaun, Co. Waterford and the Devils Punchbowl, Co. Corries are features of glacial erosion found in upland areas , usually on north or north-east facing slopes.

Corries usually contain a lake called a tarn or corrie lake. Corries formed when snow gathered in a hollow on a mountain.

At the front edge of the corrie the ice thins out at is speeds up on its journey down valley, and this area is eroded less and crevasses form. This leaves a lip of rock. When the ice melts a corrie lake can form. Grisedale Tarn in the Lake District is a great example of a Corrie lake. How Corries are created. Where 2 corries occur back to back, they can erode backwards through the processes outlined above.

Where 3 or more corries erode backwards towards one another, this can create a Pyramidal peak , a steep-sided pointed mountain like the Matterhorn. As corrie glaciers leave their source regions and descend down old river valleys they can make huge changes to the landscape. One of the major changes they make is to the V-shaped valleys characteristic of the upper reaches of river valleys. This becomes compacted and the air is squeezed out leaving ice. The back wall of the corrie gets steeper due to freeze-thaw weathering and plucking.

The base of the corrie becomes deeper due to abrasion. As the glacier gets heavier it moves downhill. The glacier moves out of the hollow in a circular motion called rotational slip. Due to less erosion at the front of the glacier a corrie lip is formed. Answered by Grace B. Answered by Bethany R. Answered by Harvey M. Answered by Sam S. Payment Security.