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Which of these pairs of elements was discovered before the 14th century?
Earth
Which of these pairs of elements was discovered before the 14th century?
Gold And Oxygen
Tin And Silicon
Sulfur And Sodium
Antimony And Carbon
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Which scale is used to describe a mineral's hardness?
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Which star is the closest one to Earth?
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Which material do fossils make more attractive to an architect?
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From what type of storm does a hurricane form?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What process helps to break down rocks by wind, air or rain?
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What is the name of the fossil resin that is often used in jewelry making?
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What type of gem is the Star of Africa or the Cullinar II?
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