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  • Two models are most favored for the origin of the atmosphere: outgassing or accretion. Outgassing is related to the differentiation of the Earth and release of gasses by volcanoes.
  • The hydrosphere was formed four billion years ago from the condensation of water vapor, resulting in oceans of water in which sedimentation occurred.
  • A billion years ago blue-green algae started using energy from the sun to split molecules of H2O and CO2. It recombined them into molecular oxygen. The energy process is known as photosynthesis.
  • molecules absorbed energy from the suns ultraviolet rays and split which is the ozone layer.
  • The ozone was about 200-300 nanometers 600 million years ago.
  • The oxygen was about 10% then and life was restricted to the ocean. The ozone enabled any life
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