Past volcanic activity
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Huaynaputina, Peru
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Krakatoa, Java
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Santa Maria, Guatamala
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Pinatubo, Phillipines
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Ambrym Island, Vanuatu
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Ilopango, El Salvador
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Mount Thera, Greece
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Mt Tamboura, Indonesia
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Novarupta, Alaska
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Baitoushan , Japan
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