Different types of mountains can be seen in different parts of the world. Geographers and geologists have categorised them according to the major cause of their formation that they find out in their investigation. They have kept all the mountains in 4 types. The first category is based on the tectonic forces and is termed Fold mountains and Block mountains. When two plates collide the less dense continental crust lifts up and gets folded. Contrary to it, when two plates diverge at the faults in the crust then one side rises in relation to the other. The other two types are Volcanic mountains and Erosion mountains.