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The Atmosphere

The History of the Atmosphere

The Ancient Atmosphere  and  Oceans

How did Life Begin on the Earth?

Photosynthesis   -   Oxygen   -   Carbon Dioxide

Nitrogen   -   The Ozone Layer

The Atmosphere Today

The Proportion of Oxygen in the Air

Useful Products from the Air

The Earth

    Water, Carbon and Nitrogen Cycles     Revision Questions    

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