The very early atmosphere mainly consisted of ____, water vapour, ammonia and ____. Due to volcanic activity levels of ____ started to increase. As the planet cooled the water vapour ____ to form the oceans. After about a billion years ____ evolved in the oceans which could carry out ____. This caused levels of carbon dioxide to ____ and levels of ____ to increase. Carbon dioxide also ____ in the oceans and was used to make ____ rocks. More complex ____ began to evolve and ____ evolved to use the oxygen for ____.

AW Yr 11 Evolution of the Atmosphere

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