Paragraph : The outer most range of the Himalayas is called Shivaliks. They extend over a width of 10-50 kms and have an altitude varying between 900and 1100 metres. These ranges are composed of unconsolidated sediments brought down by the rivers from the main Himalayan ranges located farther north. These valleys are covered with thick gravel and alluvium. The longitudinal valley lying between lesser Himalaya and the Shivaliks are known as Duns Dehra dun. Kotli Dun and patli Dun are some of the well known Duns.
21. What are Duns ?
22. Name some well known Duns?
23. Name the three major division of Himalayas from North to South?
24. Give the extent and altitude of the outer most range of Himalayas?
25. Name the passes that lie in the Great Himalayas?
Answers
Answer:
21. Duns are longitudinal valleys created when the Eurasian plate and the Indian plate collided as a result of folding. Among lesser Himalayas and shiwaliks, they are formed. The valleys are accumulated with coarse alluvium passed down by Himalayan rivers.
22. Dehra Dun, Kotli Dun and Patli Dun
23. Three major geographical entities, the Himadri (greater Himalaya), Himanchal (lesser Himalaya) and the Shiwaliks (outer Himalaya), extend almost uninterrupted throughout its length and are separated by major geological fault lines.
24. It rises to 25,646 feet (7,817 metres) at Nanda Devi, the range's highest peak, and to 25,446 feet (7,756 metres) at Kamet, near the Chinese border. At elevations above 14,000 feet (4,300 metres), snow covers the mountains throughout the year.
25. Passes in the Great Himalayas — Karakoram pa.ss, Shipkila pa.ss, Nathula, Bomdila pa.ss.