FILE PHOTO: Pisciarelli fumaroles and mud pools from the Campi Flegrei caldera, a supervolcano, near Naples. June 6, 2013 CARMINE MINOPOLI/AFP.
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Dec
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FILE PHOTO: Pisciarelli fumaroles and mud pools from the Campi Flegrei caldera, a supervolcano, near Naples. June 6, 2013 CARMINE MINOPOLI/AFP.
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