U-shaped valley - Wikipedia


** U-shaped valley **

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A glaciated valley in the Altai Mountains showing the characteristic U
U-shaped valley in Leh valley, Ladakh, NW Indian Himalaya. The glacier
visible at the head of the valley is the last remnants of the formerly much
more extensive valley glacier which carved this valley.

*U-shaped valleys*, or *glacial troughs*, are formed by the process of
glaciation. They are characteristic of mountain glaciation in
particular.^[1] They have a characteristic U shape, with steep, straight
sides and a flat bottom. Glaciated valleys are formed when a glacier
travels across and down a slope, carving the valley by the action of
scouring.^[2] When the ice recedes or thaws, the valley remains, often
littered with small boulders that were transported within the ice, called
glacial till or glacial erratic.

Examples of U-valleys are found in mountainous regions like the Alps,
Himalaya, Rocky mountains, Scottish Highlands, Scandinavia, New Zealand and
Canada. A classic glacial trough is in Glacier National Park in Montana,
USA in which the St. Mary River runs.


· 1 Formation

· 1.1 Shape
· 1.2 Valley floor

· 2 History
· 3 See also
· 4 References


Glacier Valley formation
Illustration of a U-shaped valley being formed


Formation of a U-shaped valley happens over geologic time, meaning not
during a human’s lifespan. It can take anywhere between 10,000 and
100,000 years for a V-shaped valley to be carved into a U-shaped
valley.^[3] These valleys can be

Source: en.wikipedia.org/wiki/U-shaped_valley

how is a u shaped valley formed

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