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Atmosphere Timeline
53
Transcript
4.6 b.y.a
The beginning of the formation of the Earth
4.5 b.y.a
Early Atmosphere - Formation of the approximately homogeneous solid Earth by planetesimal accretion.
4.0 b.y.a
Secondary Atmosphere - Planet surface cools and bombardment from space slows, so life has possibility of existing on the planet.
3.5 - 2.8 b.y.a
Beginning of photosynthesis by blue-green algae which releases oxygen molecules into the atmosphere and steadily works to strengthen the ozone layer and change the Earth's chemically reducing atmosphere into a chemically oxidizing one.
2.0 b.y.a
Oxygen begins to rise in the atmosphere after oxygen sinks saturated. The Oklo natural fission reactor in Gabon goes into operation.
1.5 b.y.a
Oxygen levels in the atmosphere reaches present day level and stabilizes. Chloroplast and mitochondria present, Eukaryotic cell organisms develop.
Atmosphere Timeline
By Matej, Jolie, Beth, Kelsy and Finn
4.5 b.y.a
1.5 b.y.a
4.6 b.y.a
3.5 - 2.8 b.y.a
4.0 b.y.a
2.0 b.y.a
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