The Evolution of the Atmosphere 4.0 / 5 based on 1 rating ? ChemistryThe earth and its atmosphereGCSEAQA Created by: ZaraCreated on: 13-01-13 19:54 What amount of nitrogen is in the atmosphere? 78% 1 of 19 What amount of oxygen is in the atmosphere? 21% 2 of 19 What types of other gases are in the atmosphere? Mainly carbon dioxide, noble gases and water vapour 3 of 19 What was the Earth's surface originally made of? Molten 4 of 19 When the molten cooled down, what formed and what kept happening? A thin crust formed, but volcanows kept erupting 5 of 19 The volcanoes gave out a lot of ...? Gas 6 of 19 What do we think the gas formed? The oceans and the atmosphere 7 of 19 What was the early atmosphere mainly made of? Carbon dioxide 8 of 19 What other things might have been in the atmosphere? Small amounts of methane, water vapour and ammonia 9 of 19 When did the oceans form? When the water vapour condensed 10 of 19 After a while, a lot of the ........ .......... dissolved into the oceans? Carbon dioxide 11 of 19 The green plants and algae also absorbed some of the ....... ...... and produced ...... by photosynthesis? The green plants and algae absorbed some of the carbon dioxide and produced O2 by photosynthesis 12 of 19 When plants and algae died, what were they buried under? Layers of sediment, along with skeletons and the shells of marine organisms 13 of 19 What happened to the carbon and hydrocarbons inside the plants and algae? They became 'locked up' in sedimentary rocks as insoluble carbonates (limestone) and fossil fuels 14 of 19 When we burn fossil fuels today, what happens? The 'locked up' carbon is released and the concentration of carbon dioxide in the atmosphere rises 15 of 19 What did the build up of oxygen in the atmosphere do? It killed off some early organisms that couldn't tolerate it. But it allowed more complex organisms to evolve and flourish 16 of 19 What else did oxygen create? The ozone layer 17 of 19 What did the ozone layer do? It blocked harmful rays from the Sun and enabled even more complex organisms to evolve - like us 18 of 19 Is there a lot of carbon dioxide left now? No 19 of 19
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