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簡介：地質學家通過冰核研究發現出距今7萬5千年左右，北極出現大氣硫含量超標，推斷地球遭遇巨大的火山大爆發，最終確定是多巴火山噴發出的硫酸鹽所形成的酸雲，大氣中的酸性物質阻斷了90%的陽光，這就是古人類的史前大災難。收起
史前大災難 [地理中國] 20111111
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