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A valley itself cannot cause erosion, but can be hugely affected by erosion. Usually Valley erosion is caused by glaciers, a common agent of erosion.
In cross-section: A 'U' shaped valley is formed from glacial erosion. A 'V' shaped valley is formed by river erosion.
CAVERN or canyon- It is also called, in text book, a V-Shaped valley, or sometimes even a gorge, but these are formed by water falls. Ask me how waterfalls form gorges if you wish.
Folding and differential erosion
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Erosion
A valley itself cannot cause erosion, but can be hugely affected by erosion. Usually Valley erosion is caused by glaciers, a common agent of erosion.
In cross-section: A 'U' shaped valley is formed from glacial erosion. A 'V' shaped valley is formed by river erosion.
CAVERN or canyon- It is also called, in text book, a V-Shaped valley, or sometimes even a gorge, but these are formed by water falls. Ask me how waterfalls form gorges if you wish.
There is no "typical" valley depth - valleys can range from a depth of only a few feet to hundreds of feet deep depending upon the weathering and erosion taking place in the valley.
Folding and differential erosion
A U-shaped valley is a geological formation formed by the erosive action of a glacier. Ice moving downhill carves out a broad, U-shaped valley with steep sides and a flat bottom. These valleys are characteristic of areas that have been shaped by glacier activity.
Generally soil erosion caused by water, wind or both.
The entire valley is from erosion and glaciers.
The Narrow Valley was created in 1921-06.
Possibly a Canyon. Formed mostly by the violent action of running water leading to intense erosion of highland regions\areas.