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Early atmosphere ~4.5 billion years ago Mostly Hydrogen and Helium Escaped into space

Early atmosphere ~4.5 billion years ago Mostly Hydrogen and Helium Escaped into space Outgassing of water vapor and CO2 created a secondary atmosphere with some nitrogen As liquid water formed the oceans and CO2 was removed from atmosphere The atmosphere became dominated by nitrogen.

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Early atmosphere ~4.5 billion years ago Mostly Hydrogen and Helium Escaped into space

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  1. Early atmosphere ~4.5 billion years ago Mostly Hydrogen and Helium Escaped into space Outgassing of water vapor and CO2 created a secondary atmosphere with some nitrogen As liquid water formed the oceans and CO2 was removed from atmosphere The atmosphere became dominated by nitrogen. ~ 2 billion years ago oxygen increased in the atmosphere because of plant life and photosynthesis. Oxygen reach it’s present level, making up 21% of the dry atmosphere about 500 million years ago.

  2. 78 % Nitrogen N2 20.95 % Oxygen O2 Dry atmosphere 0.93 % Argon Ar H2O 0 to 4 % Carbon Dioxide CO2 0 to .037 % (or 370 ppm) Methane CH4 1.8 ppm Nitrous Oxide N2O .3 ppm Ozone 0.04 ppm or 40 ppb) Aerosols (particles) highly variable

  3. N2O Nitrous Oxide

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