History of the Universe

   

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Physical Environment > Atmosphere

This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand.

 
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The Earth's atmosphere today contains the following gases (among others)

Gas

% by Volume

nitrogen

78

oxygen

21

argon

0.9

carbon dioxide

0.03

The oxygen in today's atmosphere has all been released by plants.
   
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Physical Environment > Atmosphere

   

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