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It is formed when two glaciers erode parallel from each other or when two glaciers erode towards each other

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What is the name of a knife edged ridge between two corries?

arete


What is a wall between two corries?

An arete.


How is an arete formed?

An arête is a thin ridge of rock which is formed when two glaciers erode parallel U-shaped valleys. The arête is a thin ridge of rock that is left separating the two valleys Arêtes can also form when two glacial cirques erode head wards towards one another, although frequently this results in a saddle-shaped pass, called a col. The edge is then sharpened by freeze-thaw weathering. Where three or more cirques meet, a pyramidal peak is created. - (a famous example is the 'Matterhorn'). Form the above it must be clear that arêtes are landforms found in mountainous terrains that have been subject to glaciation. They are therefore very common in the Alps.


When multiple glaciers start their downward flow from a single point they create a what kind of land feature?

When multiple glaciers start their downward flow from a single point, they create a land feature known as a "paternoster lake" if they form a series of small lakes, or a "glacial cirque" if they carve out a bowl-shaped depression. This formation is typically characterized by steep cliffs and a rugged terrain shaped by the erosive power of the glaciers. The converging flow can also lead to the development of a "horn" or "arete" if the surrounding peaks are shaped by glaciers.


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