how the ushaped valley was created
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Valley glaciers carve U-shaped valleys, as opposed to the V-shaped valleys carved by rivers. During periods when Earth's climate cools, glaciers form and begin to flow downslope. ... After the glacier retreats, it leaves behind a flat-bottomed, steep-walled U-shaped valley.
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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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