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How much plant material to provide me with oxygen?
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If you mix liquid oxygen and liquid nitrogen, what happens?
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Why not break down excess carbon dioxide into carbon and oxygen? |
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If trees make all our oxygen, what's the minimum number of trees needed?
Started by Elvis PresleyBoard General Science |
Replies: 18 Views: 26290 |
01/12/2011 05:00:32 by johan_M |