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A gigantic 'fountain of magma' has been discovered under the Yellowstone supervolcano, sparking fears that a deadly eruption could be imminent.
Magma plumes are unusual geological features that are found at the boundary between the Earth's core and the mantle. They rise through the mantle into the crust, creating a column of rising ash and debris.
The researchers that discovered the plume believe it could stretch all the way from Yellowstone in the state of Wyoming down to Mexico.
This news follows a spate of mini tremors in the area last week - which raised fears the supervolcano beneath the national park could be about to blow.