Question

how himalyas was formed

Answer 1

the Himalayas were formed by the collision between Indian plate and Eurasian plate which begins 50millions years ago.
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Answer 2

the oldest landmass was a part of gondwanaland which included India Australia South Africa Australia
convectional current splits the current into many pieces leading to the drifting of the Indo Australian plate towards the north
the northward drift resulted in the collision with the much larger Eurasian plate
due to this collision the sedimentary rocks accumulated in the tethys were folded to form the mountain system of Western Asia and Himalayas
the Himalayas represent a youthful topography with high peaks deep valleys and fast flowing rivers