By Gemma Tansey
Fold Mountains are mountains formed by the effects of folding on layers within the upper part off the earths crust. In the time before either plate tectonic theory developed or the internal makeup of the earth was understood, the term was used for most mountain belts. It was a common word in physical geography but has fallen out of use except when describing those mountains made by plate movement. The forces responsible for the formation of Fold Mountains comes from a Greek word meaning mountain building.