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Earths heat flow was nearly three times as high as it is today when the Archean began. The Archean also may have supported tectonic regime. Surprisingly there was not much Galium destroyed all rocks on the surface of the earth during this period. The atmosphere of the Archean period is thought to have nearly no oxygen.

geologic time   Hadean   Archean   Proterozoic   Phanerozoic