Write longitudinal division of himalayas

The Himalaya consists of three parallel ranges in its longitudinal extent a number. A number of valleys lie between these ranges. The northernmost range is known as the great on the inner Himalayas or the Himadri. It is the most continuous range consisting of the loftiest peaks with an average height of 6000 M. It contains all the prominent Himalayan peaks. The range lying to the south of the Himadri forms the most rugged mountain system and is known as Himachal or lesser Himalaya. The Ranges are mainly composed of highly compressed and altered rocks. The altitude where is between 3700 and 4500 M and the average with is of 50 km. The outermost range of the Himalayas is called the shivaliks. They extend over a with of 10 to 50 km and have an altitude varying between 900 and 1100 metres.