A brief explanation a about what the Himalayas are in informative and Interesting content and through Photogarphs. Useful for school kids and college goings students as well
2. The Himalayas : Basic Facts
Called Himadri, Himvan, Himanchal
Central Axial Range : 22 degrees of Longitude.
Total Distance : 2400 Km
Total Area : 5 lakh sq km
Central Pivot : Pamir Plateau
Southern Boundary : 300 m contour
Northern Boundary : Obscure & merges with
edge ofTibetean Plateau
Peaks : 8000(14), 7500(20), 7300(94) 6000(NC)
3.
4. Features
High Altitude
SteepGradient
Deeply DissectedTopography
Complex Geological Structure
Snow capped summits
RichTemperate Flora in Sub-tropical latitude
6. Origin
Upliftment in Phases
Great Geosyncline – Sea ofTethys
Squeezed folds between Gondwana and
Angaraland
Convex shape towards south (due o push of
Aravalis and Assom ranges)
Multiple ranges due to a long phase of pushing
3 phases : 120 mybp – Great Himalayas
25 to 30 mybp – Middle Himalayas
2 to 20 mybp - Shiwaliks
7.
8. Evidences
Late Cretaceous to-Date
Avg. Ht 1mybp – 2410 m
Now - 3050
Earthquake Occurrences
Isostatic Equilibrium
Fossils alongTibetian Plateau and Shiwaliks
are similar (similar climate)
Youthful Himalayan rivers in Rejuvenation
(Terraces along Banks)
13. The Himalayan Ranges
Series of parallel
ranges
Intermediate deep
valleys
‘Hogback’ appearance
Abrupt rise in Oudh
and Bengal
Western Himalayas
Gradual