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簡介：它是自然界的定時炸彈！黃石國家公園超級火山被認為是世界上最大的活火山，它每60萬年就會噴發一次。最近的一次大規模噴發發生在64萬年前，黃石國家公園出現的一些跡象也許在警告人們，超級火山即將噴發。這也是科學家一直擔心的問題。收起
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