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
Book | |
What's in the Box? | 1 x ExtinctionHow Life On Earth Nearly Ended 250 Million Years Ago |
Publisher Date:
10/11/2005
Number of Pages::
296
Binding:
Hard Back
ISBN:
9780691005249
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.
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