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IndDent

IndDent

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which one of these is not naturally occurring: O2, Cl2, SiO2 N2

My answer is Cl2...SiO2 is sand, and that seems to be naturally occurring.
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IndDent said:
which one of these is not naturally occurring: O2, Cl2, SiO2 N2

My answer is Cl2...SiO2 is sand, and that seems to be naturally occurring.
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O2 - DUH
 
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it says...NOT naturally occurring...how is that O2?
 
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