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In this frame grab made Wednesday, July 16, 2014, Andrei Plekhanov, a senior researcher at the Scientific Research Center of the Arctic, stands at a crater, discovered recently in the Yamal Peninsula, in Yamalo-Nenets Autonomous Okrug, Russia. Russian scientists said Thursday july 17, 2014 that they believe a 60-meter wide crater, discovered recently in far northern Siberia, could be the result of changing temperatures in the region. Andrei Plekhanov said 80 percent of the crater appeared to be made up of ice and that there were no traces of an explosion, eliminating the possibility that a meteorite had struck the region. (AP Photo/Associated Press Television)

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