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  • Volcanos explode causing carbon dioxide to be formed, along with water.(CO2, H2O.)
  • The volcanos erupting cause the earth to heat up but slowly over time it began to cool down.
  • Because the earth began to cool this the caused it to start raining.
  • The rain falling cause the oceans to develop. Once this had happened calls started to form in the ocean which the started photosynthesis.
  • Because photosynthesis started this causes carbon dioxide levels to fall and oxygen levels to rise.
  • The microbes the make the nitrogen that formed the current atmosphere.
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