Very early atmosphere: Volcanoes released gases, Little oxygen, Lots of carbon dioxide, Some ammonia and methane, Water vapour , After plants evolved: More oxygen, Less carbon dioxide, They carried out photosynthesis, Atmosphere today: More carbon dioxide from burning fossil fuels, 21% oxygen, 78% nitrogen, 0.04% carbon dioxide, <1% argon/noble gases,

Changes to the Earths atmosphere

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