When himalyas were formed a major event effevted the plateau in the south of himalyas.extensive volcanic erruption took placewestern part subcidedindian ocean advanced to occupy this depression IN THIS WAY THE ARABIAN SEA WAS FORMED
When the Himalayan Range was being formed due to collission of Indo-Australian Plate and Eurasian Plate, there was a volcanic eruption in the southwestern part of Deccan plateau. Th part of affected region got submerged and in this way the Arabian Sea was formed.
1 1 1