The movement of a mass of rocks, debris, soil etc., downslope is called a landslide. A landslide is a large amount of earth, rock, and other material that moves down a steep slope. Landslides happen when a layer of earth or rocks separates from the layer below it. The force of gravity pulls the loose layer downward. Landslides can be highly destructive. They can bury or sweep away everything in their path. They can block rivers or cover entire towns. A landslide needs a steep slope to get its start.
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