An elevated,U-shaped valley formed as a result of a tributary alpine glacier is called a hanging valley.

Question

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This is correct. A hanging valley is formed when a smaller tributary glacier flows into a larger glacier and erodes a U-shaped valley that sits higher above the main valley due to differences in the depth and rate of erosion between the two glaciers. When the glacier melts, a waterfall may form at the hanging valley where it meets the main valley.

An Elevated,U-Shaped Valley Formed as a Result of a Tributary