Answer:
(a)
The oldest landmass of India (peninsular part) was a part of Gondwana land.
(b) Gondwana land included India, Australia, Africa and South America as
one single landmass.
(c) Convectional currents split the crust into a number of
pieces, thereby leading to the drifting of the Indo-Australian plate after
being separated from Gondwana land towards the North.
(d) The Northward drift resulted in the collision of the plate
with the much larger Eurasian plate.
(e) Due to this collision the sedimentary rocks which were
accumulated in the geosyncline known as the Tethys, were folded to form the
mountain systems of West Asia and Himalayas.
(f) The Himalayas represent a youthful topography with
high peaks, deep valleys and fast flowing rivers.
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