Mountains are formed by the movements of tectonic plates or glaciers. When two continental plates push toward each other and lift up or subduct, a mountain range is formed. The gradual movement of glaciers can also carve out mountains and rivers. Over time, however, erosion ensures that all mountains are worn down and away. So how jagged a mountain is depends on how it was formed as well as how long it has existed. Mountain ranges with sharper peaks tend to be newer than those that already already partially worn away.
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