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This is Scientific Americana 60 Seconds Science, I'm Christopher Intagliata, got a minute.The Sahara desert isn't known for its greenery, but there's evidence it was once much lusher than today, dotted with waterfall and lakes, now a study suggests three massive1 rivers used to plough through the desert too, cutting pathways north to the * coast.
Researchers use climate models to estimate rainfall more than the 100,000 years ago, they found the ancient * formed four hundreds miles north of where they do today, spreading rain on the mountains and central Sahara, that storm water would have drained north powering three rivers the size of the Nile and forming vast wetland in what is now Libya. The west most river, referred to as the * was the most likely pass for migrants and clusters2 of archaeological sites in * and * back up to that idea, the analysis is in the journal Plus One. There is no telling whether humans made it to Europe by these routes, but the alternatives were traveling along the Africa's west coast or up the Nile. So these rivers would offer a nice shortcut3, now of course, the waterways with buried beneath the dooms4, along with any foot prints our ancestors may have left behind. Thanks for the minute, for Scientific American 60 Seconds Science, I'm Christopher Intagliata.
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1 massive | |
adj.巨大的,大规模的,大量的,大范围的 | |
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2 clusters | |
n.(果实、花等的)串( cluster的名词复数 );簇;(人、物等的)群;组v.(使)集中( cluster的第三人称单数 ) | |
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3 shortcut | |
n.近路,捷径 | |
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4 dooms | |
v.注定( doom的第三人称单数 );判定;使…的失败(或灭亡、毁灭、坏结局)成为必然;宣判 | |
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