【摘 要】
：
自去年入冬至上月底,世界各地普降大雪,美国、北欧三国、希腊、约旦等国均遭受暴风雪袭击.我国除北方地区降雪严重外,昆明、桂林、上海等南方地区也出现大范围雨雪和暴冷天气
论文部分内容阅读
自去年入冬至上月底,世界各地普降大雪,美国、北欧三国、希腊、约旦等国均遭受暴风雪袭击.我国除北方地区降雪严重外,昆明、桂林、上海等南方地区也出现大范围雨雪和暴冷天气,打破了连续几年的暖冬现象.地球到底是在变热,还是变冷?美国地质年会提出热门话题--平均气温为摄氏零下五十度,不仅南极和北极,包括赤道在内的整个地球都被厚厚的冰层所覆盖;受地下岩浆的影响,地球上的水变得极为稀少,生物被迫躲到了海洋深处……这异常残酷的一幕,曾经出现在大约七亿或六亿年前的地球上.近来,被称为“地球雪球说”的这一假设,成了研究人员的热门话题.对地层的深入研究以及计算机仿真实验,都为这一假设提供了令人信服的数据.
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