Earth's atmosphere 0.0 / 5 ? ChemistryThe earth and its atmosphereGCSEAll boards Created by: nicole beaumontCreated on: 22-09-18 17:31 How much Oxygen is there in today's atmosphere? 21% 1 of 7 At the start of the atmosphere what caused their to be some much carbon dioxide? Volcanic Activity 2 of 7 what killed off early organisms? build up of oxygen 3 of 7 How did oceans form? water vapour condensing 4 of 7 How much carbon dioxide is in todays atmosphere? 0.03% 5 of 7 How much argon is in today's atmosphere? 1% 6 of 7 What started to evolve 2.7 billion years ago? simple organisms 7 of 7
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