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250 million years ago, toxic coal ash caused a mass extinction

One of the biggest episodes of mass extinction may have been caused 250 million years ago because of toxic ash resulting from burning coal. In the current Nature Geoscience, a team led by Stephen Grasby of the Geological Survey of Canada—Calgary, report evidence the eruption of the Siberian volcanoes torched massive

Volcanic eruption caused one of Earth’s largest mass extinctions

One of the Earth’s largest extinctions was likely caused 260 million years ago by a massive volcanic eruption in southwest China. The eruptions, which spewed about 500,000 cubic kilometers (120,000 cubic miles) of lava over half a million years, killed more than half of the life on the planet in the

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