C1 Topic 1: Atmosphere 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEEdexcel Created by: bridgetadjeiCreated on: 30-04-16 11:57 What was present in the early atmosphere? Carbon Dioxide (CO2) and water vapour (H20) 1 of 12 What was there a lot of in the early atmosphere? Carbon dioxide (CO2) 2 of 12 What formed the early atmosphere? Volcanic activity 3 of 12 What is present in today's atmosphere? Nitrogen (N2), Oxygen (O2) and other gases (eg CO2, Argon etc.) 4 of 12 What percentage of today's atmosphere is Nitrogen? 78% 5 of 12 What percentage of the today's atmosphere is Oxygen? 21% 6 of 12 What percentage of today's atmosphere are other gases? 1% 7 of 12 What happened to the water vapour in the early atmosphere? The earth cooled down (condensation occured) and the water vapour dropped onto the Earth and formed oceans 8 of 12 Why was there a decrease of CO2 and an increase of O2 in today's atmosphere? Photosynthesis in plants used up CO2 and gave out O2 9 of 12 What is today's atmosphere affected by? Human activity (eg deforestation and burning fuels) 10 of 12 What has happened if there is ever a change of volume of 21%? O2 has been used 11 of 12 Why was there a decrease in CO2 in today's atmosphere? The CO2 dissolved in the oceans when they were formed by the cooling of the earth 12 of 12
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