I think it's because of water flowing and creating crevasses in the rock.
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A mountain pass is formed through various geological processes such as erosion by water, ice, and wind, which gradually carve a gap or saddle into the mountain range. Over time, the movement of tectonic plates can also contribute to the formation of mountain passes by creating fault lines or fractures that weaken the rock, making it easier for erosion to occur.
Mountain passes are typically formed by the erosive forces of glaciers, rivers, and weathering processes such as freeze-thaw cycles. Over time, the constant movement of ice, water, and rock fragments carves out a low point in a mountain range, creating a pass for travel.
Mountain passes are typically formed by glacial erosion, where the movement of glaciers carves out a low point between mountain peaks. The glacier's forceful movement and abrasive action can widen and deepen a pass, creating a gap in the mountain range.
The 3-letter name given to a mountain pass is "Col."
The Earth's tallest mountain ranges are formed at convergent plate boundaries.
Mountain horns are often formed by erosion, specifically glacial erosion. Glaciers erode sediment and rock as they move over the landscape, creating steep, sharp peaks with a distinctive horn-shaped structure, such as the Matterhorn in the Swiss Alps.