GreenGrl » nile river http://greengrl.org Taking Care of Mother Earth Thu, 24 May 2012 06:55:17 +0000 en hourly 1 http://wordpress.org/?v=3.1.3 What made the climate of northern Africa change from tropical to grasslands, and then to desert? http://greengrl.org/what-made-the-climate-of-northern-africa-change-from-tropical-to-grasslands-and-then-to-desert/ http://greengrl.org/what-made-the-climate-of-northern-africa-change-from-tropical-to-grasslands-and-then-to-desert/#comments Fri, 09 Apr 2010 18:15:17 +0000 admin http://greengrl.org/what-made-the-climate-of-northern-africa-change-from-tropical-to-grasslands-and-then-to-desert/ What made the climate of northern Africa change from tropical to grasslands, and then to desert?

tilt of the earth’s axis
the Nile River
Ice Ages
overpopulation of the region

Please only answer if you know FOR SURE.

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