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ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

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ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

By: Douglas H Erwin

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Some 250 million years ago, the earth suffered the greatest biological crisis in its history. Around 95% of all living species died out--a global catastrophe far greater than the dinosaurs' demise 65 million years ago. How this happened remains a mystery. But there are many competing theories. Some blame huge volcanic eruptions that covered an area as large as the continental United States; others argue for sudden changes in ocean levels and chemistry, including burps of methane gas; and still others cite the impact of an extraterrestrial object, similar to what caused the dinosaurs' extinction.
Publication Date: 10/11/2005
Number of Pages: 296
Binding: Hard Back
ISBN: 9780691005249
Categories: RP - Current Affairs Books Politics & Current Affairs Non Fiction Online Book Bazar Up To 60% Online Book Bazar Up To 60% 50% OFF

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