Human Evolution Had Rocky Start
Geology may be a long-overlooked, major factor that created conditions favoring the evolution of modern humans.
It's fairly well-established that changing climate, and thus vegetation, in East Africa spurred human evolution, but there has been no agreement about what exactly caused that change, said Royhan Gani from the University of Utah. He thinks the riddle's answer is in rocks, and how big slabs of it move — altering continents and building mountains — by a process called tectonics.
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