The Himalayas are relatively young mountains formed from the sediment deposited in the ancient Tethys Sea. The Tethys Sea lay between ancient land masses of Laurasia in the north and Gondawanaland in the south about 185 million years ago. The two land masses moved closer due to movements inside the earth and then collide with each other. This caused the seabed of the Tethys Sea to fold upwards, forming the mountains. The Himalayas are rising even now.
