Every person who is moderately interested in dinosaurs knows the theory that they were wiped out some 66 million years ago when an asteroid or comet struck Earth, causing the most famous mass extinction event in history.What many people do not realise is that moment was not the most devastating mass extinction event to hit the planet, far from it actually.During the Late Ordivician Period 450 million years ago, volcanic activity drove the second-worst mass extinction event in Earth’s history,…

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