【摘 要】
：
“凶手”还是“救星”rn尽管恐龙在地球上存在了1.7亿年,但是人们谈论最多的还是它们的灭绝.对于这个问题,现存的答案有很多.主流观点认为,是一颗小行星的撞击造成了恐龙的灭
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“凶手”还是“救星”rn尽管恐龙在地球上存在了1.7亿年,但是人们谈论最多的还是它们的灭绝.对于这个问题,现存的答案有很多.主流观点认为,是一颗小行星的撞击造成了恐龙的灭绝.那次撞击砸出了一个直径达180千米的大坑,全球被推入至暗时刻,光合作用停止了,气温降至极低,酸雨肆虐,植物枯萎,动物相继死亡,恐龙也在那次意外的打击下永远告别了地球生命的舞台.
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