Aretes and pyramidal peaks are important features of glacial erosion. Make sure you know how they are formed adn can draw a diagram to show this. If you don't read this note and check out scalloway revision for diagrams.
It is not too difficult to imagine what would happen if another corrie formed on another part of the mountain. The mountain would be worn away on at least three sides, and only a large peak shaped like a pyramid would be left. This is called a pyramidal peak.
Aretes form when 2 corries meet and erode back to back on a mountain. When this happens a a very steep narrow piece of land is all that is left between the corries. This piece of land is called a ridge and when it is in between two corries it is called an arête. Look at the photo of the arête and make sure you can see the two corries back to back and the sharp piece of land in between.
It is not too difficult to imagine what would happen if another corrie formed on another part of the mountain. The mountain would be worn away on at least three sides, and only a large peak shaped like a pyramid would be left. This is called a pyramidal peak.
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