The Indian plate started moving towards the Eurasian plateand the Tethys Sea between the two began to contract due to this movement.There occurred the lateral compression of the marine sediments in the bed of the Tethys Sea.  Geologists believe that the sediments got folded giving rise to the ranges of Himalayas.
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The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today. 225 million years ago (Ma) India was a large island situated off the Australian coast and separated from Asia by the Tethys Ocean.