Volcanoes Likely Caused Earth's Biggest Mass Extinction, The Great Dying The Great Dying killed off 95 percent of marine and terrestrial life 252 million years ago. Mercury found in ancient rock offers persuasive evidence volcanic eruptions are behind the biggest mass extinction that occurred on Earth. by Allan Adamson
Science Smithsonian Documentary 'Mass Extinction: Life at the Brink' a Scary Warning about How Humans Are Accelerating Their Own Destruction by Rhodi Lee