Green Plants
oxygen producing organisms
The free oxygen bubbled up from the oceans.
free oxygen
free oxygen
The Archean atmosphere is believed to have been free of free oxygen. Banded iron formations did not occur till near the end of the Archean period.
cyanobacteria
photosynthesis by cyanobacteria
oxygen producing organisms
Oxygen is an extremely chemically active element, which is why things can burn in our current atmosphere. In the early Earth, all the oxygen had reacted with other chemicals in the environment, so that there was no free oxygen. Only later, when photosynthesis was used by green plants, was there a source of free oxygen.
The free oxygen bubbled up from the oceans.
Photosynthesis is the source of virtually all the free oxygen in the earth's atmosphere.
Photosynthesis is the source of virtually all the free oxygen in the earth's atmosphere.
free oxygen
Free oxygen
free oxygen
No. Jupiter's atmosphere is mostly hydrogen and helium with no free oxygen.
32% the of the atmosphere is Argon, Oxygen and Other stuff