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Erosion Power


Erosion Power
Waterfalls appear to be permanent landscape features, but they are constantly changing thanks to the geological process of erosion. Erosion is the gradual wearing down of rock. Rivers transport sand, pebbles and even boulders, which act like sandpaper to grind down rock.

Waterfalls often form when rivers flow from hard to softer rocks. Over thousands of years, the softer rocks erode and the riverbed steepens. The river accelerates down the steep slope, which increases its erosive power. Eventually the slope is near vertical and the river begins cutting backward. As sections of the overhang collapse, the waterfall gradually moves upstream toward the river’s source.

Erosion Power