Which of the following best describes a rock fall? Group of answer choices a. a slow and gradual movement of material do

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Which of the following best describes a rock fall?
Group of answer choices
a. a slow and gradual movement of material downslope,
b. a nearly vertical movement of debris from a slope or steep
cliff,
c. a viscous, turbulent flow of material over the landscape,
d. a slide that occurs along a basal slip surface.