Posted on 05/08/2008 2:12:41 PM PDT by suthener
OSLO (Reuters) - The once-green Sahara turned to desert over thousands of years rather than in an abrupt shift as previously believed, according to a study on Thursday that may help understanding of future climate changes.
And there are now signs of a tiny shift back towards greener conditions in parts of the Sahara, apparently because of OSLO (Reuters) - The once-green Sahara turned to desert over thousands of years rather than in an abrupt shift as previously believed, according to a study on Thursday that may help understanding of future climate changes.
And there are now signs of a tiny shift back towards greener conditions in parts of the Sahara, apparently because of global warming, said the lead author of the report about the desert's history published in the journal Science. , said the lead author of the report about the desert's history published in the journal Science.
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Gods |
Blast from the Past. |
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· Mirabilis · Texas AM Anthropology News · Yahoo Anthro & Archaeo · · History or Science & Nature Podcasts · Excerpt, or Link only? · cgk's list of ping lists · |
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GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach | |
Just updating the GGG info, not sending a general distribution.12,400 years ago? Hydrologic cycle came to a screeching whoa for some reason, hmm, what could it have been?Evolution in Your FaceLake Victoria, Africa's largest lake, is home to more than 300 species of cichlids. These fish, which are popular in aquariums, are deep-bodied and have one nostril, rather than the usual two, on each side of the head. Seismic profiles and cores of the lake taken by a team headed by Thomas C. Johnson of the University of Minnesota, reveal that the lake dried up completely about 12,400 years ago. This means that the rate of speciation of cichlid fishes has been extremely rapid: something on average of one new species every 40 years! |
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