Mountain ranges mainly consisting of uplifted folded sedimentary rocks are called Fold Mountains.
When these rocks are subjected to horizontal compressional forces for millions of years, they get bent into up and down folds.
This leads to the formation of anticlines and synclines.
Such earth movements occur from time to time and lift the folds to a considerable height which result in the formation of Fold Mountains.
The Himalayas in Asia, the Alps in Europe, the Rockies in North America and the Andes in South America are the most prominent fold mountains of the world.
Since these mountain ranges were formed during the most recent mountain building period, they are known as young fold mountains.
Some of these mountain ranges, for example, Himalayas, are still rising.
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