Mountains are formed when a layer of Earth crust is pushed (forced) up in big folds of blocks. Slowly over the course of millions of year’s mountains are not all the same, there however many types of mountains, which are fold block, dome and volcanic mountains are jigged because they are constantly eroded by the weather. The weather wears the rocky surface away.

Block mountains

When a slab of land breaks of and is forced up a block mountains is formed this is because the tectonic plates pull apart or push together.

Tectonic are large large parts of the earth,  crust they are slowly moving .

Dome mountains

Liquid rock pushed up against the earths   crust. The liquid rock does not break through the earth and creates a dome.

A brilliant information page on mountains and how they are formed. Great use of subheadings and pictures.