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Is the Dinosaur-Apocalypse Story Wrong?

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If you went to school after 1980, you probably learned that the dinosaurs went extinct because of a huge asteroid smashing into the earth 66 millions years ago. If you went to school before 1980, you probably heard that it could be any one of a dozen different reasons and we possibly might never know the exact cause of the dinosaurs extinction. One of the competing ideas is that the mass extinction was caused by the Deccan Traps, a group of volcanoes that erupted for thousands of years, so long that they poisoned the entire earth. This hypothesis has been promoted by paleontologist Gerta Keller for decades, but it was overshadowed by physicist Luis Alvarez' discovery of the iridium layer that pinpointed the date of the asteroid. Scientists are still arguing over the reason for the death of the dinos, which you can read about at The Atlantic. -via Digg

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Hm, admittedly, I know next to nothing about this, but is it possible that there was no single cause for the extinction event? Maybe it was both the asteroids and the volcanoes - or asteroids and an unusually long period of drought that destabilized the ecology enough to "prime" the situation for a mass extinction?
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