Researchers say mercury buried in ancient rock provides the strongest evidence yet that volcanoes caused the biggest mass extinction in the history of the Earth.

A volcanic eruption spells doom for a predatory gorgonopsid during the Permian Period
[Credit: Margaret Weiner/UC Creative Services]The extinction 252 million years ago was so dramatic and widespread that scientists call it “the Great Dying.” The catastrophe killed off more…

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Source: archeo