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A horn is a sharp, pointed peak formed by glacial erosion. It develops when three or more cirques, which are amphitheater-shaped basins at the head of glacial valleys, erode into a mountain from multiple sides. As these cirques expand, they carve away the rock between them, leaving behind steep, knife-like ridges called arĂȘtes. When these arĂȘtes converge at a single point, they form a horn. The Matterhorn in the Swiss Alps is a famous example of a horn.123

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