Waterfall

A waterfall is a place where a river or stream drops suddenly from a higher level to a lower one over a steep step, rocky ledge, or cliff. It often forms where water encounters rocks with different resistance to erosion. Softer rock can wear away faster than harder rock, creating a difference in height. Faults, volcanic activity, landslides, and former glaciers can also help shape the land.

Falling water may deepen a basin at the base and weaken the rock above, allowing the edge of the waterfall to retreat slowly upstream. Some waterfalls flow all year, while others become stronger after heavy rain or snowmelt. Their size and shape depend on the water flow, the river channel, and the local geology.

Waterfalls are part of freshwater environments and can provide habitats for organisms that tolerate wet rocks, spray, and fast-moving water. Mosses, plants, insects, and other species may live nearby, although strong currents can limit the movement of some aquatic animals. Waterfalls also contribute to erosion and affect the transport of sediment along a river.

People have used some as landmarks and, where conditions allow, as sources of hydroelectric power. Many are also places for tourism and scientific study. Their surroundings can be dangerous because of slippery rocks, strong currents, and sudden changes in water flow. A waterfall is therefore a dynamic landform shaped by the interaction of water, rock, and geological processes.