- Beneath Yellowstone, A Volcano That Could Wipe Out U.S.: "We've long known that Yellowstone is merely the skin on top of a supervolcano -- a giant pool of magma sitting just under the Earth's surface. Exactly how giant has been the subject of much speculation. Until now." http://nypost.com/2013/12/12/beneath-yellowstone-a-volcano-that-could-wipe-out-u-s/ 643 comments worldnews