How many asteroids hit Earth?- What Really Killed the Dinosaurs?

Submitted by Anonymous on Fri, 02/12/2010 - 22:30

Scientists take a closer look at the layers of rock beneath the site of one of the largest asteroid impacts on the planet to see how many asteroids it must have taken to drive the dinosaurs to extinction. Fascinating video from BBC Horizon show 'What Really Killed the Dinosaurs?'

See video

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