In the first billion years of the Earth's lifetime, its surface was covered in volcanoes , Volcanoes erupted and released gases , Scientists think these gases formed the early atmosphere , In the early atmosphere there was no oxygen , The early atmosphere was similar to the atmospheres of Mars and Venus , Oceans formed when the water vapour condensed , Carbon Dioxide dissolved in the oceans , Carbon dioxide was taken in during photosynthesis , Plants and algae produced oxygen during photosynthesis , In the current atmosphere Nitrogen is the most abundant gas ,

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