Extinction: How Life On Earth Nearly Ended 250 Million Years Ago

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ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago

By: Douglas H Erwin

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Publication Date:

Nov, 10 2005

Binding:

Hard Back

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In Stock

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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.