Gases in the atmosphere 5.0 / 5 based on 6 ratings ? ChemistryThe earth and its atmosphereGCSEEdexcel Created by: tillywithwingsCreated on: 03-03-15 13:55 Which is the main gas in the atmosphere? Nitrogen 1 of 2 Why did the proportion of oxygen go up as the atmosphere developed? Photosynthesis let it out 2 of 2
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