<P> Fold mountains are mountains that form mainly by the effects of folding on layers within the upper part of the Earth's crust . 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 . The forces responsible for formation of fold mountains are called orogenic movements . The term orogenic has derived from a Greek word meaning mountain building . These forces act at tangent to the surface of the earth and are primarily a result of plate tectonics . </P> <P> Fold mountains form when two tectonic plates move towards each other at a convergent plate boundary . Fold mountains form from sedimentary rocks that accumulate along the margins of continents . When plates and the continents riding on them collide, the accumulated layers of rock may crumple and fold like a tablecloth that is pushed across a table, particularly if there is a mechanically weak layer such as salt . They are also present in south africa, in many regions of the Western cape province . </P> <Ul> <Li> The Jura mountains - A series of sub-parallel mountainous ridges that formed by folding over a Triassic evaporite decollement due to thrust movements in the foreland of the Alps </Li> <Li> The' Simply Folded Belt' of the Zagros Mountains - A series of elongated anticlinal domes, mostly formed as detachment folds over underlying thrusts in the foreland of the Zagros collisional belt, generally above a basal decollement that formed in evaporite of the late Neoproterozoic to Early Cambrian Hormuz Formation </Li> <Li> The Akwapim - Togo ranges in Ghana </Li> <Li> The Ridge - and - Valley Appalachians in the eastern part of United States . </Li> </Ul>

Where are fold mountains found in the world