Yellowstone, Wyoming
A supervolcano under Yellowstone national park is 2.5 times bigger than previously thought and could be "catastrophic" for the planet if it were to erupt. With a 90 km-long magma chamber, geologists say it could produce an ash cloud that would make two-thirds of the US uninhabitable. Luckily, scientists say no eruption is imminent, but they will be keeping a close eye on it!
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