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added by globalquiz.org Feb. 11, 2016, 3:20 p.m.
Which of the following is not a chemical element?
iridium
limestone
tungsten
tin
Iridium, tungsten and tin are chemical elements. Limestone is a common sedimentary rock composed mainly of skeletal fragments of marine organisms.
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Very interesting!
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Votes

+1 Very interesting!  hanif ahmed
      Acceptable  Cleo
      Acceptable  BrainCharge