chemistry c1 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEOCR Created by: Ellie2882Created on: 29-03-16 11:55 how much nitrogen is in the atmosphere seventy eight percent 1 of 11 how much oxygen is in the atmosphere twenty one percent 2 of 11 how much argon is in the atmosphere one percent 3 of 11 what was the earths surface originally molten 4 of 11 after things cooled down what kept forming volcanoes 5 of 11 what was most the atmosphere formed of before plants started to evolve carbon dioxide 6 of 11 what did the water vapor do when the earth cooled condense 7 of 11 what process did the plants produce us to produce oxygen photosynthsis 8 of 11 when the plants died they were buried under layers of sediment, what did the carbon that the plants took up turn into fossil fuels 9 of 11 what did the build up of oxygen in the atmosphere kill off early organisms 10 of 11 how was the build up of oxygen in the atmosphere a good thing as they were killing off early organisms. what were the other organisms called complex organisms 11 of 11
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