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Meaning of Great Oxygenation Event | Babel Free

Noun CEFR C1

Definitions

A period around 2.5 to 2.3 billion years ago when the atmosphere of the Earth and its shallow oceans saw a sustained increase in oxygen, caused by the widespread proliferation of photosynthetic cyanobacteria.

CEFR level

C1
Advanced
This word is part of the CEFR C1 vocabulary — advanced level.
See all C1 English words →

See also

Great Pacific Garbage Patch Great Patriotic War Great Paxton Great Peace of Montreal Great Plains Great Plains rat snake

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