Extinction: How Life On Earth Nearly Ended 250 Million Years Ago,New Hardcover Has Disappeared From The Nations

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Extinction: How Life On Earth Nearly Ended 250 Million Years Ago,New Hardcover Has Disappeared From The NationsSome 250 Million Years Ago, The Earth Suffered The Greatest Biological Crisis In Its History. Around 95% Of All Living Species Died Outa 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,