Mass movements are of three basic types, distinguished from
each other by the way that the rock, soil, water, and debris
move. Slides move over and in contact with the underlying
surface, while flows include movements of regolith, rock,
water, and air in which the moving mass breaks into many
pieces that flow in a chaotic mass movement. Falls move
freely through the air, and land at the base of the slope or
escarpment. There is a continuum between different processes
of mass wasting, but many differ in terms of the velocity of
downslope movement and also in the relative concentrations
of sediment, water, and air. A landslide is a general name for
any downslope movement of a mass of bedrock, regolith, or
a mixture of rock and soil, and it is used to indicate any mass
wasting process.
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