Ebb and flow of the sea drives world's big extinction events

If you are curious about Earth's periodic mass extinction events such as the sudden demise of the dinosaurs 65 million years ago, you might consider crashing asteroids and sky-darkening super volcanoes as culprits.

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<p><a href="http://www.physorg.com/news132757002.html">Ebb and flow of the sea drives world's big extinction events</a></p> <p>If you are curious about Earth's periodic mass extinction events such as the sudden demise of the dinosaurs 65 million years ago, you might consider crashing asteroids and sky-darkening super volcanoes as culprits.</p>