Geologists Say 'Wall Of Africa' Allowed Humanity To Emerge

ScienceDaily (Dec. 22, 2007) — Scientists long have focused on how climate and vegetation allowed human ancestors to evolve in Africa. Now, University of Utah geologists are calling renewed attention to the idea that ground movements formed mountains and valleys, creating environments that favored the emergence of humanity.

"Tectonics [movement of Earth's crust] was ultimately responsible for the evolution of humankind," Royhan and Nahid Gani of the university's Energy and Geoscience Institute write in the January, 2008, issue of Geotimes, published by the American Geological Institute.

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http://www.sciencedaily.com/releases/2007/12/071219082604.htm