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1 Fault-block mountains-Fault-block mountains are formed along faults where some large blocks of rock are forced upwards while others are forced down. 2  The higher area is sometimes called a horst and the lower a graben (see the picture below).
When gravity (downwards) is the direction of maximum stress and one or other of the horizontal stresses decays slightly, fault block mountains form. When gravity (downwards) becomes the lowest stress, reverse faults (thrusts) and fold mountains are formed.