Chemistry - Chapter 7 (P2) 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEAQA Created by: rebeccamariaCreated on: 02-04-15 11:45 What caused the proportion of oxygen in the atmosphere to increase? Photosynthesis 1 of 17 What gases are present in atmosphere today? Nitrogen, oxygen, argon and carbon dioxide 2 of 17 Which is the most abundant gas in the atmosphere? Nitrogen 3 of 17 Which was the most abundant gas in the early atmosphere? Carbon dioxide 4 of 17 What is the approximate percentage of nitrogen in the atmosphere today? 78% 5 of 17 What is the approximate percentage of oxygen in the atmosphere today? 21% 6 of 17 What is the approximate percentage of argon in the atmosphere today? 1% 7 of 17 What is the approximate percentage of carbon dioxide in the atmosphere today? 0.04% 8 of 17 What were the first two gases in the early atmosphere? Helium and hydrogen 9 of 17 What is the reason for the decrease in carbon dioxide in the Earth's atmosphere? It's locked up in fossil fuels and sedimentary rocks 10 of 17 The oceans were formed when _______ condensed? Steam/Water Vapour 11 of 17 In Earth's early atmosphere what was the surface made of? Molten 12 of 17 What gases did volcanoes give out in Earth's early atmosphere? water vapour, carbon dioxide, methane, ammonia 13 of 17 When was the Earth formed; according to scientists? 4.5 billion years ago 14 of 17 What is condensation? Is when a gas changes/turns into a liquid 15 of 17 What is evaporation? Is when a liquid changes/turns into a gas 16 of 17 Describe how the oxygen was formed. By the plants through photosynthesis 17 of 17
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