Hidden beneath Yellowstone National Park is a supervolcano, capable of blasting over 1,000 cubic kilometres of rock and ash into the air, and plunging Earth into darkness.
While the supervolcano hasn't erupted for 631,000 years, scientists have been working to understand what caused the last eruption.
Their findings suggest that the forces that lead to an eruption move much more rapidly than previously believed.
They claim new magma moves beneath Yellowstone only decades before a devastating eruption.
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