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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).
BLOCK MOUNTAINS. Block mountains are mountains formed when layers of rock crack into giant blocks. Cracks in layers of rock are called faults. They form when the Earthâs crust is stretched, squashed, or twisted. The blocks are free to slip up, down, or sideways, or to tip over.t was formed along the western margin of South America, where two tectonic plates (rocky plates that make up the Earthâs crust) collided. The mountains are still rising by about 10 cm (4 in) every century. Fold mountains are pushed up at a boundary where two tectonic plates collide.