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CHEMISTRY UNIT 12 - THE EARTH & ITS ATMOSPHERE (Greenhouse Effect (All…
CHEMISTRY UNIT 12 - THE EARTH & ITS ATMOSPHERE 
Evolution of Atmosphere
Phase 2 - Oceans, Algae & Plants absorb CO2
Lots of CO2 removed from early atmos as it dissolved in the oceans & went through series of reactions to form carbonate precipitates that formed sediments on seabed
Later marine animals evolved & their shells & skeletons contained some of these carbonates from the oceans
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Composition of Present Day Atmosphere
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1% other gases e.g. CO2, noble gases & water vapour
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Greenhouse Effect
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Greenhouse gases like CO2, methane & water vapour like insulating layer in Earth's atmos - allowing Earth to be warm enough to support life
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Major Sources of Carbon Monoxide, Sulfur Dioxide & Oxides of Nitrogen
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Evidence
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