Landslides, dramatic events in the natural world, involve the movement of rock, soil, and debris down a slope. These movements can vary significantly in speed, ranging from a slow creep that occurs over many years to a rapid and devastating collapse that takes place in a matter of seconds. The forces of gravity, constantly acting upon the earth's surface, are the primary driving force behind these phenomena. When the forces of gravity exceed the resisting forces of the materials composing the slope, instability results, and a landslide is initiated.
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