Mass wasting movement type and primary earth material. Primary Material Type and Common Name of Slide 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. In addition, mass-wasting types often share common morphological features observed on the surface, such as the head scarp-commonly seen as crescent shapes on a cliff face hummocky or uneven surfaces accumulations of talus-loose rocky material falling from above and toe of the slope, which covers existing surface material. The figure and table show the terms used. Mass-wasting events are classified by type of movement and type of material, and there are several ways to classify these events.
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