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by Ellie Zolfagharifard
Dailymail.com
It could release 1 ft layer of molten ash 1,000 miles from the National Park
It would be 1,000 times as powerful as the 1980 Mount St Helens eruption
A haze would drap over the United States, causing temperatures to drop
Experts say there is a 1 in 700,000 annual chance of a eruption at the site
A supervolcano in the heart of America's northwest has the potential to blanket the US in a 'nuclear winter'.
If it were to erupt, the Yellowstone supervolcano would be one thousand times as powerful as the 1980 Mount St Helens eruption, experts claim.
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