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- 4.5 bya, the newly formed Earth was under constant tectonic motion, leading to volcanic eruptions which introduced carbon dioxide to the atmosphere
- H2O (gas)
- Roughly 3.5 bya, the atmosphere had low amounts of H2, but whatever was present often reacted with CO2 to produce methane, resulting in a slight increase of the compound in the atmosphere.
- CO2 + H2= CH4 + H2O
- O2
- Roughly 3.5 bya, the atmosphere had low amounts of H2, but whatever was present often reacted with CO2 to produce methane, resulting in a slight increase of the compound in the atmosphere.
- CO2 + H2 = CH4 + H2O
- 3.6 bya, decrease in the frequency of geothermal events led to drops in global temperatures, which caused water vapor to condense into liquid water, resulting in only a bit of vapor left in the atmosphere.
- H2O (liquid)
- As plant life started to become much more complex and abundant, oxygen levels steeply increased due to widespread photosynthesis
- Today, atmospheric composition hasn't changed much. However, since the industrial revolution, harmful greenhouse gases like CO2 and CH4 have become concentrated.
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