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A form of mass movement in which fractured rock and soil separates into blocks and falls away from the parent slope. A fall starts with the detachment of soil or rock from a steep slope along a surface on which little or no shear displacement takes place. The material then descends mainly through the air by falling, bouncing, or rolling (Varnes in R. Schuster and R. Krizek, eds 1996).

Subjects: Earth Sciences and Geography.

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