Did volcanoes do in the dinos?

Geologists have long attributed the disappearance of the dinosaurs to a catastrophic asteroid impact. But some scientists wonder if other factors–like massive volcanic eruptions in present-day India–didn’t have a hand in it too. That idea is bolstered by new research that finds a spike in mercury around the time of the extinction. Learn more in my podcast for Scientific American.

Tyrannosaurus_Rex_Holotype
65 million years ago, three quarters of species went extinct, including Tyrannosaurus rex, above. (Credit: Scott Robert Anselmo via Wikimedia)
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