Ever Changing Earth 0.0 / 5 ? ScienceEver Changing EarthGCSEWJEC Created by: HannahNicCowCreated on: 11-02-18 13:20 How much of the Earth's atmosphere is argon (+other noble gases)? 1% (0.9) 1 of 10 Which gas makes up 78% of the atmosphere? Nitrogen 2 of 10 How much of the Earths atmosphere is oxygen? 21% 3 of 10 Which gas makes up 0.04% of the atmosphere? Carbon Dioxide 4 of 10 Which gases made up the early atmosphere and where did they come from? Carbon dioxide, ammonia and water vapour from volcanoes 5 of 10 Why did the oceans form? The Earth's temperature dropped and water vapour condensed 6 of 10 Why did oxygen levels increase? Bacteria began photosynthesising and producing oxygen 7 of 10 Why did carbon dioxide levels decrease? It dissolved in oceans, became trapped in fossil fuels and was used in photosynthesis 8 of 10 By which three processes can carbon dioxide levels be added to and removed from the atmosphere? Respiration (produced as a waste product), Combustion (produced), photosynthesis (reacts with water) 9 of 10 How does acid rain form? Sulphur dioxide is released from factories and reacts with rain to form sulphuric acid 10 of 10
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