A major drop in temperature 137 million years ago briefly interrupted the warm, equable climate of the Cretaceous Period. The water temperature in the Arctic Ocean fell from around 13 C to between 4 and 7 C, possibly causing ...
Earth Sciences
Sep 14, 2010
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Inside caves near Mossel Bay, South Africa, a team of explorers have been piecing together an account of survival, ingenuity and endurance -- of the species known as Homo sapiens. Team leader Curtis Marean, a paleoanthropologist ...
Archaeology
Aug 5, 2010
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