What is the most common gas in earths atmosphere?

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How old is the earths atmosphere? What role did volcanoes play in the early development of earths atmosphere? What was likely the most common gas in the early years of earths atmosphere? How was the CO2 removed from the atmosphere? How where osion How where oceans formed? When did the earths atmosphere begin to look as it currently does? What is a greenhouse gas? what are examples of greenhouse gases? how many greenhouse gases are there? What are some of the human causes of greenhouse gasses? Why do we need some greenhouse gasses? How do greenhouse gasses effect the climate? What are the consequences of climate change? What is a carbon footprint? How are carbon footprints measured? What are some ways to decrease your carbon footprint? What is air pollution? What are some of the causes of air pollution? What is sedimentary rock? Give an example of a fossil fuel How does sulphur dioxide cause acid rain? What are some environmental problems with acid rain? Where does acid rai happen? 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