Yellowstone To Kill 900 Bison During Winter Cull

September 17, 2014 12:35 AM

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FILE - In this Friday, Aug. 15, 1997 file photo, an unidentified pair of visitors to the Yellowstone National Park photograph the Old Faithful geyser as it rockets 100-feet skyward in Wyoming. Hundreds of small earthquakes at Yellowstone National Park in recent weeks have been an unsettling reminder for some people that underneath the park's famous geysers and majestic scenery lurks one of the world's biggest volcanoes. (AP Photo/Kevork Djansezian, File)

FILE - This graphic provided by University of Utah geophysicists shows the first large-scale picture of the electrical conductivity of the gigantic underground plume of hot and partly molten rock that feeds the Yellowstone supervolcano. The plume of molten rock feeding the supervolcano under the sur...

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