GEOG 1350 Lecture 5: geog1350 lec5 notes
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De nition: downslope movements of rock or sediment as a result of gravity. Movement is classi ed as rapid if it can be detected by eye. This is based on 4 variables: mechanism of movement, type of material, amount of water present, speed of movement. Fall: rock or sediment dropping off the face of a cliff. Slide:downslope movement along a discrete failure plane. Ow: movement of particles semi independently of one another, commonly with the aid of water. Rock fall: this mass movement is caused by fall mechanism. It involves rock rolling down a steep slope or falling through the air. Slump: in this mass movement the failure plane is curved upward. Creep: this mass movement is caused by a ow mechanism. Speed of movement ranges a few millimetres to a metre annually. The stability of a slope is based on the balance between two types of forces: