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12 Cards in this Set

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