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Mass extinction linked to ancient climate change

Harlequinmania

By Harlequinmania,
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Harlequinmania

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About 450 million years ago, Earth suffered the second-largest mass extinction in its history -- the Late Ordovician mass extinction, during which more than 75 percent of marine species died. Exactly what caused this tremendous loss in biodiversity remains a mystery, but now scientists have discovered new details supporting the idea that the mass extinction was linked to a cooling climate.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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