Landslides occur principally when the bedding planes on a slope dip at a 
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steep angle and when there is no support at the end of the slope. Various 
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types of landslides occur depending on the slope and the composition of 
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the rock. This example shows heavy, massive rock overlying a layer of 
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clay that has become saturated with water so that it lubricates the 
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movement of the rock above it. In a typical landslide, the mass of rock 
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moves rapidly downslope in a unit that disintegrates into rock fragments 
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before it comes to rest.