Slides can be further subdivided into rock slides, debris slides, or earth slides depending on the type of the material involved (see table). Translational slides often are rapid movements along a plane of distinct weakness between the overlying slide material and the more stable underlying material. Rotational slides commonly show slow movement along a curved rupture surface.
Falls are strongly influenced by gravity, mechanical weathering, and water. Movement occurs as free-falling, bouncing, and rolling. Rocks separate along existing natural breaks such as fractures or bedding planes. Falls are abrupt rock movements that detach from steep slopes or cliffs. The most common mass-wasting types are falls, rotational and translational slides, flows, and creep.
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