The maximum slope at which sand will not slump under the force of gravity is called the

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The maximum slope at which sand will not slump under the force of gravity is called the angle of repose. This is the steepest angle that loose grains can maintain without sliding downslope. Choice A ("backslope") and D ("crest") are not related to this concept. Choice B ("slip face") refers to the steep slope on the downwind side of a sand dune, but is not necessarily related to the angle of repose. Choice E ("slumping process") is a general term that refers to a variety of mass wasting processes, but is not specifically related to the angle of repose for sand.

The Maximum Slope at Which Sand Will Not Slump Under