Question

Define U-shaped vally. How is it formed?

Answer 1

Answer:

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Explanation:

U-shaped valleys have steep sides and a wide, flat floor. They are usually straight and deep. They are formed in river valleys which, during the ice age, have been filled by a large glacier . These glaciers have deepened, straightened and widened the valley by plucking and abrasion.

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Answer 2

Explanation:

U-shaped valleys, trough 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 or rounded bottom (by contrast, valleys carved by rivers tend to be V-shaped in cross-section). 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.

When a U-shaped valley extends into saltwater, becoming an inlet of the sea, it is called a fjord, originally the Norwegian word for these formations that are common in Norway. Outside of Norway, a classic U-shaped valley that is also a fjord is the Western Brook Pond Fjord in Gros Morne National Park in Newfoundland, Canada.