撒哈拉沙漠发现远古部落罕见墓葬群(组图)(8)
2009-05-22 08:57:10
金鹰网
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研究人员介绍说,在距今约1.2万年前,由于地球运行轨道的细微变化及其他多种因素,导致非洲的季风带向北稍稍偏移,在一段时期内给撒哈拉北部带来降雨,于是原本干旱的地区出现湖泊绿洲。
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