Earth's Atmosphere

All the information you need for AQA about the earth's atmosphere, both in early years and in present day.

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Earth's Early Atmosphere

Percentages

Carbon dioxide: 95%

Water vapour: 4%

Methane: 0.5%

Ammonia: 0.5%

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Earth's Early Atmosphere

Billions of years ago on Earth, there was lots of volcanic activity.

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Earth's Early Atmosphere

This released the gases which made up the atmosphere.

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Earth's Early Atmosphere

It was a lot like the composition of Mars or Venus.

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Earth's Early Atmosphere

Gradually, water vapour in the air condensed to form oceans.

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Earth's Early Atmosphere

Green plants evolved - which absorb carbon dioxide and give out oxygen during photosynthesis.

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Earth's Early Atmosphere

Carbon dioxide became locked up in fossil fuels, plants and sedimentary rocks, especially limestone.

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Earth's Present Day Atmosphere

Percentages:

Nitrogen: 80%

Oxygen: 20%

Carbon dioxide: Trace

Water vapour/ Noble gases: Trace

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Earth's Present Day Atmosphere

In the present day atmosphere, oxygen is produced by plants.

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Earth's Present Day Atmosphere

Carbon dioxide is dissolved in the oceans; this affects marine life.

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Earth's Present Day Atmosphere

Carbon dioxide is released when fossil fuels are burnt.

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Earth's Present Day Atmosphere

Scientists are constantly monitoring the level of carbon dioxide in the atmosphere.

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Earth's Present Day Atmosphere

Burning fossil fuels increases the level of carbon dioxide and causes global warming.

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