The Fold Mountains are of two types:
- New or Young Fold Mountains - The Alps, the Himalayas, the Circum-Pacific oceanic mountains, etc., are worth mentioning. The main characteristics of these mountains are the complex folding of the rocks, faulting, Volcanic, activities, cordillera form, the erosion and weathering caused by running water, ice, winds, etc., the existence of glacier-capped high peaks, etc.
- Old Fold Mountains - This type includes the Caledonian and Hercynian mountains of Central Europe, the Pennines, the highlands of Scotland, etc. These mountains were folded in very ancient times. They were, then, subjected to denudation and uplift, many faults were formed and the layers of the rock were wrapped. Many mountains exist as relics, due to erosion. The presence of monadnocks, accordant summits, sculptured domes, the irregular forms of peaks, relics plateaus, etc., are some of the important characteristics of these mountains.
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