India accounts for the bulk of the Indian subcontinent, lying atop the Indian tectonic plate, a part of the Indo-Australian Plate.[163] India's defining geological processes began 75 million years ago when the Indian Plate, then part of the southern supercontinent Gondwana, began a north-eastward drift caused by seafloor spreading to its south-west, and later, south and south-east.[163] Simultaneously, the vast Tethyan oceanic crust, to its northeast, began to subduct under the Eurasian Plate.[163] These dual processes, driven by convection in the Earth's mantle, both created the Indian Ocean and caused the Indian continental crust eventually to under-thrust Eurasia and to uplift the Himalayas.[163] Immediately south of the emerging Himalayas, plate movement created a vast trough that rapidly filled with river-borne sediment[164] and now constitutes the Indo-Gangetic Plain.[165] Cut off from the plain by the ancient Aravalli Range lies the Thar Desert.

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