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What killed the dinosaurs? An asteroid or volcanoes? Or both?

Princeton University

What killed the dinosaurs? An asteroid or volcanoes? Or both?

USA TODAY - Doyle Rice

Maybe it wasn't just the asteroid that killed off most of the dinosaurs 66 million years ago: New research reveals how volcanoes half a world away may have played a role. An asteroid slammed into the Earth near present-day Mexico, unleashing huge tsunamis and ash that blotted out the sun. That led …

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