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12 Cards in this Set
- Front
- Back
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What is the best conductor of electricity?
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silver
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Name the rarest gemstone.
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ruby
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Name the lightweight, rustproof metal which is silvery colored.
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aluminum
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What is the most useful of the metals?
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iron
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Name the hardest of minerals and substances.
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diamonds
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This is the only metal which is liquid at room temperature.
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mercury
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What is used in pencils as the lead?
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graphite
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Called "mudballs" and can be hollow or solid.
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geode
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What breaks into flat sheets and is paper thin?
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mica
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What rock is used for arrow heads?
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flint
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What is a source of nuclear power?
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uranium
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What mineral is used in plaster of Paris?
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gypsum
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