Rock falls occur when a piece of rock on a steep slope becomes dislodged and falls down the slope. Debris falls are similar except they involve a mixture of soil, regolith, vegatation, and rocks. A rock fall may be a single rock or a mass of rocks, and the falling rocks can dislodge other rocks as they collide with the cliff. Because this process involves the free fall of material, falls commonly occur where there are steep cliffs. At the base of most cliffs is an accumulation of fallen material termed talus. This is an obvious danger to humans if they are in the path of the falling rocks.
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