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Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
a. x rays
b. cosmic rays
c. infrared waves
d. ultraviolet rays
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Nan element’s square on the periodic table, the number with the greatest numerical value represents the
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How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.
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What physical property of gold makes panning a useful way to get gold from streams?
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Which one of the following types of electromagnetic radiation causes certain substances to fluoresce...
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