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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).
Fault-block mountains form due to divergent boundary plates. because they do.   Because the Earth's crust is composed of not one solid layer like a shell, but many pieces, like in a puzzle. These plates are floating on layer of magma. A plate boundary zone is a broad belt in which boundaries are not  well define.