Atmospheric changes: Chemistry of the atmosphere: Chemistry: GCSE (9:1)

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13 Terms

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Atmosphere

A thin layer of gases surrounding Earth

<p>A thin layer of gases surrounding Earth</p>
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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

<p>CO2, H2O, Nitrogen</p>
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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

<p>Volcanoes</p>
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Photosynthesis

Carbon dioxide + water -> glucose + oxygen

<p>Carbon dioxide + water -> glucose + oxygen</p>
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Oxygen increased

by photosynthesis of algae and bacteria

<p>by photosynthesis of algae and bacteria</p>
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Sedimentary rocks

Rock that forms when sediments such as carbonates and dead organisms are squashed together over time

<p>Rock that forms when sediments such as carbonates and dead organisms are squashed together over time</p>

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