Arêtes, horns, and U-shaped valleys are erosional features carved from bedrock by valley glaciers.

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Arêtes, horns, and U-shaped valleys are all classic features of landscapes shaped by the movement of valley glaciers. Arêtes are narrow ridges that form where two glaciers erode parallel U-shaped valleys into a ridge of rock; horns are sharp peaks that form when three or more glaciers erode a single mountain into an irregular shape. U-shaped valleys, as the name suggests, have a distinctive U-shaped cross-section due to the continued movement of the glacier gouging out a wide depression over time.

Arêtes, Horns, and U-Shaped Valleys Are Erosional Features Carved from Bedrock