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a. The relatively free falling or precipitous movement of a newly detached
segment of bedrock (usually massive, homogeneous, or jointed) of any size
from a cliff or other very steep slope; it is the fastest form of mass
movement and is most frequent in mountain areas and during spring when
there is repeated freezing and thawing of water in cracks in the rock.
Movement may be straight down, or in a series of leaps and bounds down the
slope; it is not guided by an underlying slip surface. AGI
b. The mass of rock moving in or moved by a rockfall; a mass of fallen
rocks. Also spelled rock fall. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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