PhysOrg Posted November 5, 2015 Share Posted November 5, 2015 Throughout the past 600 million years there have been five major mass extinction events that devastated life on Earth. While some of these events are very well studied, such as the killer asteroid that wiped out the dinosaurs 66 million years ago, others are more enigmatic and entertain a variety of possible causes. Read the full article on phys.org Link to comment Share on other sites More sharing options...
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