This iron will become important later. The Archean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from ...

There are certain things that have become mainstays on Earth. One of these things is the ocean being blue, there are kindergarten rhymes about this fact and popular songs written on this topic.

The subsequent Archean eon (approximately 3,500 million years ... and the Phanerozoic eon coincides with the major diversification of animals, plants, and fungi.

This iron will become important later. The Archaean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from ...