India comprises the bulk of the Indian subcontinent and lies atop the minor Indian tectonic plate, which in turn belongs to the Indo-Australian Plate.[111] India's defining geological processes commenced 75 million years पूर्व when the Indian subcontinent, then part of the southern supercontinent Gondwana, began a north-eastward drift across the then-unformed Indian Ocean that lasted fifty million years.[111] The subcontinent's subsequent collision with, and subduction under, the Eurasian Plate bore aloft the planet's highest mountains, the Himalayas. They abut India in the north and the north-east.[111]...
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