What are the advantage of physoigraphic division of india.
Answers
Answer:The Himalayas consist of a series of parallel mountain ranges that stretch in a north-west to south-east direction. It has been recognized as a natural guard on the north of the sub-continent. The total length of the Himalayas is about 2415 kilometers and is considered to have consisted of four main sections separated by the gorges of different rivers. The Himalayas is the highest mountain range in the world. The Himalayan Mountain ranges were formed by the sediment collected on the bed of the Tethys Sea for millions of years. The sediments might have been derived from the two stable land masses—Angara land to the north and peninsular landmass to the south.
Geologists believe that the lateral force came from the northern Angaraland, and the sedimentary strata resting on the Tethys floor were tightly squeezed against the southern rigid mass of peninsular India, commonly known as Gondwanaland.
As a result, the Himalayas originated as folded mountains. The Himalayas follow a general west to east direction exactly in conformity with the alignment of the Tethys Sea. The other mountains like Aravalli, Rajmahal, and Meghalaya originated from the Gondwanaland, and are situated approximately in the north-south direction.
Geological studies reveal that the Himalayas came into the present stage as results of the development during three geological phases or epoch. During the first phase, the middle Himalayan range was raised during the Oligocene Epoch or era. This range is formed of the old crystalline and old sedimentary rocks. The squeezing of the Himalayas for the second epoch took place during Miocene era.
During this period the sediments of the Potwar Basin (now in Pakistan) were raised. The squeezing of the Himalayas for the third time took place during the latter part of the Pliocene era. The Siwaliks were formed during this time.
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