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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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