- The super-volcano beneath Yellowstone National Park in Wyoming has been rising at a record rate since 2004
Spewing lava far into the sky, a cloud of plant-killing ash would fan out and dump a layer 10ft deep up to 1,000 miles away.
Two-thirds of the U.S. could become uninhabitable as toxic air sweeps through it, grounding thousands of flights and forcing millions to leave their homes.
On the verge of a catastrophe? Yellowstone National Park's caldera has erupted three times in the last 2.1million years and scientists monitoring it say we could be in for another eruption (file picture)
Read more: http://www.dailymail.co.uk/sciencetech/article-1350123/Worlds-largest-volcano-Yellowstone-National-Park-wipe-thirds-US.html#ixzz1C7YSztxM