Volcanoes weakened dino population before asteroid, theory says

02/12/2013 | National Geographic News

A volatile environment rife with volcanic eruptions may have been killing off dinosaurs long before the arrival of the asteroid that wiped out the rest, according to research published in the journal Science. Evidence suggests that huge volcanic eruptions in India caused major climate change and a tough environment for dinosaurs to survive. In addition, using a precise dating technique on rocks found in Haiti, scientists were able to put the asteroid's impact at the exact date of the extinction, suggesting that the asteroid was the "coup de grace" for the creatures.

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