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Wikipedia: Fold mountains are mountains formed mainly by the effects of folding on layers within the upper part of the Earth's crust. In the time before either plate tectonic theory developed, or the internal architecture of thrust belts became well understood, the term was used for most mountain belts, such as the Himalayas. The term is still fairly common in physical geography literature but has otherwise generally fallen out of use except as described below.
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![The Himalayas, the world's highest mountain range, seen from space. [The Himalayas, the world's highest mountain range, seen from space.]](http://images.ookaboo.com/photo/s/Himalayas_s.jpg)