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The Himalayas, geologically young and structurally foldable, stretch over the northern borders of India. These mountain ranges run in a west-east direction from the Indus to the Brahmaputra. The Himalayas represent the loftiest and one of the most rugged mountain barriers in the world. They form an arc, which covers a distance of about 2,400 Km. Their width varies from 400 Km in Kashmir to 150 Km in Arunachal Pradesh. The altitudinal variations are greater in the eastern half than those in the western half. The Himalayas consists of three parallel ranges in their longitudinal extent. A number of valleys lie between these ranges. The northernmost range is known as the Great or Inner Himalayas or the Himadri. It is the most continuous range consisting of the loftiest peaks with an average height of 6,000 metres. It contains all prominent Himalayan peaks. The folds of the Great Himalayas are asymmetrical in nature. The core of this part of the Himalayas is composed of granite. It is perennially snowbound, and a number of glaciers descend from this range.
The range lying to the [[1]] of the Himadri forms the most rugged mountain system called Himachal.
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Detailed Solution
The Himalayas are divided into three parallel mountain ranges throughout their length. The Himachal, or lesser Himalayas, is one of the ranges. They are mostly composed of highly compacted rocks, resulting in difficult terrain. The range's altitude ranges from 3,700 to 4,500 metres, with a 50-kilometre average width.