Answer:
(i) The oldest landmass (Peninsular part) was a part of Gondwana land, which included India, Australia, South Africa and Australia. (ii) Convectional currents split the crust into many pieces, leading to the drifting of the Indo-Australian plate towards the north. (iii) The northward drift resulted in the collision with the much larger Eurasian plate. (iv) Due to this collision, the sedimentary rocks accumulated in the Tethys were folded to form the mountain system of western Asia and the Himalayas. (v) The Himalayas represent a youthful topography with high peaks, deep valleys and fast flowing rivers.
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