In a translational slide, the descending mass ________.
A. is moving and circulating within the flowing mass, behaving as a viscous fluid
B. moves as a perfectly rigid block on top of a liquid layer
C. slides as a generally intact block down a curved failure surface
D. moves along a plane approximately parallel to the slope of the surface
E. simply moves from one location to another, without specifying the mode of motion
Answer: D
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