There are several types of mountains formed by different geological processes: - Fold mountains are the most common, formed by the collision and crumpling of tectonic plates. Vast mountain ranges like the Himalayas are examples. - Fault-block mountains are created when faults in the Earth's crust force material upward, breaking the crust into chunks that move up or down. - Dome mountains form when magma pushes up a dome shape under the crust but does not erupt at the surface. Erosion then carves the circular mountain range. - Volcanic mountains are built up from eruptions of lava, ash and rock around a volcanic vent. Examples include mountains in