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RT @johnseach: Humans and volcanoes contribute equal amounts of #mercury to the environment. http://t.co/yxiPkyRu
RT @johnseach: Humans and volcanoes contribute equal amounts of #mercury to the environment. http://t.co/yxiPkyRu
RT @johnseach: Humans and volcanoes contribute equal amounts of #mercury to the environment. http://t.co/yxiPkyRu
Humans and volcanoes contribute equal amounts of #mercury to the environment. http://t.co/yxiPkyRu