Atmospheric changes
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17 Terms
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Atmosphere
A thin layer of gases surrounding Earth
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Percentage of oxygen in modern atmosphere
20%
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Percentage of nitrogen in modern atmosphere
80%
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Other gases in the modern atmosphere
CO2, H2O, Noble gases
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Age of the earth
4.6 billion years
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Age of the modern atmosphere
~20 million years
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Composition of the early atmosphere
CO2, H2O, Nitrogen
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Water vapour decreased
Because water condensed as the earth cooled, forming oceans
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Carbon dioxide decreased
dissolving in the oceans, forming sedimentary rocks, photosynthesis
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The early atmosphere was formed by
Volcanoes
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Photosynthesis
Carbon dioxide + water = glucose + oxygen
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Oxygen increased
by photosynthesis of algae and bacteria
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Sedimentary rocks
Rock that forms when sediments such as carbonates and dead organisms are squashed together over time
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Note 
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