Which type of mountain is formed by vertical pressure? Which type is formed by the upward thrusts of Earth's crust?

Fault-block mountains form when Earth's crust pushes material up and down near a fault line. Rocks that get pushed upward eventually form mountains if there is enough seismic activity. The higher part of a fault-block area is called a horst, while the lower part is called a graben, according to Ducksters.