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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