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Hadean

The Hadean period is categorized by much volcanic activity.   The oceans surface temperatures are thought to be up to 445 degrees Fahrenheit. This was do to the heavy atmospheric pressure of the Co2 atmosphere. The life could have been established in the incredibly harsh conditions.  

hadean
phanerozoic
geologic time   Hadean   Archean   Proterozoic   Phanerozoic