When a stream, wave action, or excavation by humans undercuts the base of a slope, slope failure may occur because ________.
A. the weight of the slope will have been reduced
B. ground water will be drained out of the slope
C. the shear force/stress on the base of a potential landslide mass will have been increased
D. downslope support of the slope materials will have been reduced or eliminated
E. the normal force/stress across the base of a potential landslide mass will have been reduced
Answer: D
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