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What does Hadean mean? like the underworld (hot and molten) What does Archea- mean? ancient What does Protero- mean? simple/original What does Phanero- mean? visible What does -zoic mean? animal or life How long has life on earth been alive? 4.6 bya What was the change from Hadean to Archeozoic? Molten earth with only water vapor cooled to land and oceans/seas (3.9 bya) What was the change from Archeozoic to Proterozoic? Atmosphere changed from no/low oxygen to an oxygenated atmosphere (2.5 bya) Hadean fossils... No fossils from Hadean (molten, any fossils would have melted) Archeozoic fossils... Archeabacteria and cyanobacteria fossils and chemical signatures Proterozoic fossils... Eukaryotic protists evolved