[問題] 請問遠古時期地球為何會冰凍起來？
未來應該不會再發生類似的情事吧
似乎連赤道也有厚達數公里的冰層是吧
不過也正因如此，才有後面生命的興興向榮，若無這個事件
現在的我們應該也不存在吧 這樣的說法對嗎？
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