U-shaped stream valleys are indicators that a stream valley has been glaciated.

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U-shaped valleys are characteristic features of glacial erosion. They have a wide, flat bottom and steep, straight sides that resemble the letter "U". These valleys are formed by the downward erosion of a glacier as it moves through a valley, scraping and gouging the bedrock beneath it. As the glacier retreats, it leaves behind a broad, flat-bottomed valley with steep sides that distinguish it from the typical V-shaped valleys carved by rivers.

U-Shaped Stream Valleys Are Indicators That a Stream Valley Has