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[探索发现] 【整理】2010-02-19 地球的起源 EarthMade—9

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In 2009 archaeologists made an important discovery that supports the river theory.Stone tools found not far from the site of the megalake in Tunisia. The first step is to identify the shoreline of the ancient lake.
this is good. so we've got some fresh water marks.
These tiny shells are agood sign of the lake. Now he searches for what may have been drinking the water when the lake existed.
here what we saw is part of a jaw bone,a small herd ball. three teeth,substance for gazel
So animals must have existed here in the desert when it was green.
  It's an important find, a stone age tool shows  people lived on the shore of this ancient lake. and 90,000 years ago was a turning point not just in the story of the Sahara but in the history of humanity itself. We are all the descendants of one group of people in easten Africa, the birthplace of human kind. Sometime between 80 and 120 thousand years ago,modern human started the long journey out of Africa. No one knows for certain what route they took.
The prevailing is that the Sahara was impassable,so humans left east of Africa and travelled to the coast, then crossed a land bridge into the Arabia penninsula. But draks expects that if the megalake was fed by a river system, it would have created a green corridor across the burning sands.
   So our ancestors could have followed these river systems, gone around the lakes, followed the next river system, around the next lake and the next system and the last lake and they  had been in North Africa. And we  them to move that.
To find proof of his theory, drake heads for the few areas of the desert where water still folws, an oasis.
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