A New Picture of the Early Earth… The first 700 million years of Earth’s 4.5-billion-year existence are known as the Hadean period, after Hades, or, to shed the ancient Greek name, Hell. That name seemed to fit with the common perception that the young Earth was a hot, dry, desolate landscape interspersed with seas of magma and [...]
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Mardi, décembre 2, 2008
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