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Possible Answers:
Ore.
Last seen on: –Daily Crossword Club Crossword Tuesday, 21 November 2023
–Daily Crossword Club Crossword Saturday, 18 November 2023
Daily Celebrity Crossword – 2/2/23 Top 40 Thursday
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The Archean Eon ( /ɑːrˈkiːən/ ar-KEE-ən, also spelled Archaean or Archæan) is the second of four geologic eons of Earth’s history and by definition representing the time from 4 to 2.5 billion years ago. The Archean was preceded by the Hadean Eon and followed by the Proterozoic.
The Earth during the Archean was mostly a water world: there was continental crust, but much of it was under an ocean deeper than today’s ocean. Except for some trace minerals, today’s oldest continental crust dates back to the Archean. Much of the geological detail of the Archean has been destroyed by subsequent activity. The earliest known life started in the Archean. Life was simple throughout the Archean, mostly represented by shallow-water microbial mats called stromatolites, and the atmosphere lacked free oxygen.
The word Archean comes from the Greek word arkhē (αρχή), meaning ‘beginning, origin’. It was first used in 1872, when it meant ‘of the earliest geological age’.[a] Before the Hadean Eon was recognized, the Archean spanned Earth’s early history from its formation about 4,540 million years ago until 2,500 million years ago.