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Submission + - Impact did kill the dinosaurs (

Geoffrey.landis writes: Not that there actually was any serious doubt, once the Chicxulub crater was found and dated, but there had been a few last hold-outs for a non-impact explanation for the dinosaur extinction.
Other proposed explanations were that the extinction might have been caused by the eruption of volcanoes, known as the Deccan Traps, in India, or by multiple asteroid impacts. But the argument for multiple impacts isn't supported by worldwide data, and the Deccan eruptions actually began 400,000 years before the end of the dinosaurs, Kirk Johnson of the Denver Museum of Nature and Science said.

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Impact did kill the dinosaurs

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Sentient plasmoids are a gas.