Keywords |
  • Geology


The Archean is the second geological eon of the Precambrian supereon. It extends from 3800 million years ago to 1900 million years ago. In this eon the first single-celled organisms, the prokaryotes, appeared. During this period there were also several hundred million years of rain and the mean global temperature remained unchanged at about 23°C.

Archean Archean

Archean - 1 Photo


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