80 million years ago: As the Indo-Australian
Plate moved northward, it began descending beneath the Eurasian Plate.
40 million years ago: An intervening oceanic basin was completely consumed, causing
the Indian and Asian continents to collide.
Today: The two plates continue to collide, deforming rock and raising the Himalaya at
a rate of 1 cm (0.4 in) a year.