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Oxygen (view source)

Revision as of 20:01, April 2, 2007

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Approximately 20% of the [[atmosphere]] is made up of oxygen.
 
Approximately 20% of the [[atmosphere]] is made up of oxygen.
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[[Category:Science]]
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[[Category:Chemistry]]
 
[[Category:Chemistry]]
 
[[Category:Elements]]
 
[[Category:Elements]]
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