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Open Image ModalHot lava flows from the crater of Mount Sinabung, North Sumatra, Indonesia on June 18, 2015. (credit:AP Photo/Binsar Bakkara)
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Open Image ModalThe Calbuco volcano near Puerto Varas, Chile, erupts on April 22, 2015. (credit:AP Photo/Diego Main/Aton Chile)
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Open Image ModalLava flows out of the Piton de la Fournaise volcano on May 19, 2015 on the island of La Réunion in the Indian Ocean. (credit:AFP/Getty Images/Richard Bouhet)
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Open Image ModalAsh and steam rise from the Popocatépetl volcano in Central Mexico on March 25, 2015. (credit:AP Photo/Dario Lopez-Mills)
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Open Image ModalLava flows from the crater of Mayon volcano in southeast Manila, Philippines, on Sept. 17, 2014. (credit:Getty Images/Charism Sayat)
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Open Image ModalLava spews out of a volcano in the Eyjafjallajökull glacier in southern Iceland on March 21, 2010. (credit:AFP/Getty Images/Fiór Kjartansson)
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Open Image ModalVolcanic lightning and lava spew from the Calbuco volcano in southern Chile in April 23, 2015. (credit:AFP Photo/Martin Bernetti)
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Open Image ModalThe Tungurahua volcano in Ecuador spews a column of ash on April 4, 2014. (credit:AP Photo)
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Open Image ModalAsh and lava spew from the Calbuco volcano in sourthern Chile on April 22, 2015. (credit:AFP/Getty Images/Diego Main)
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Open Image ModalClouds float over Mount Paektu in Ryanggang, North Korea, on June 18, 2014. (credit:AP Photo/David Guttenfelder)
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Open Image ModalSmoke billows from the Villarrica volcano in southern Santiago, Chile, on March 29, 2015. (credit:AFP/Getty Images/Sebastian Escobar)
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Open Image ModalHot lava runs down Mount Sinabung in North Sumatra, Indonesia. (credit:Getty Images/Ulet Ifansasti)
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Open Image ModalThe Villarrica volcano in Chile, shows signs of activity on April 21, 2015. (credit:AFP Photo/Sebastian Escobar)
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Open Image ModalLava flows from Mount Etna in Sicily, Italy, on Aug. 13, 2014. (credit:AFP/Getty Images/Tiziana Fabi)
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Open Image ModalThe Sinabung volcano in North Sumatra, Indonesia, spews smoke on June 17, 2015. (credit:Getty Images/Ulet Ifansasti)
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Open Image ModalThe Parícutin volcano violently erupts in Michoacán, Mexico, in 1943. (credit:AP Photo)
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Open Image ModalAsh and smoke billow through the clouds following the eruption of the Puyehue-Cordon Caulle volcano in southern Chile on June 15, 2011. (credit:AP Photo/Alvaro Vidal)
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Open Image ModalLava erupts from Mount Etna in Sicily, Italy, on Feb. 2, 2015. (credit:AP Photo/Davide Cautullo, Ansa)
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Open Image ModalThe Ruapehu volcano in New Zealand blasts an ash cloud on June 17, 1996. (credit:AP Photo/David Hallett)
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Open Image ModalThe Mount Yasur volcano in Vanuatu spews lava on August 7, 2010. (credit:Getty Images/Torsten Blackwood)
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Open Image ModalThe Mauna Loa volcano erupts in Hawaii on March 25, 1984. (credit:AP Photo/Ira Schwarz)
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Open Image ModalSmoke plumes from the Grímsvötn volcano under the Vatnajökull glacier in Iceland on March 21, 2011. (credit:AP Photo/Jon Gustafsson)