discoveries and inventions - password: patent

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Across
  1. 1. What shape is used in the Colosseum to provide support
  2. 4. A microscope uses ____ and lenses to magnify objects
  3. 5. The earlier timekeeping invention
  4. 7. The original material used for making billiard balls
  5. 8. The element named after Poland
  6. 9. The alphabet blind people use to read
Down
  1. 1. A device that allows divers to breathe underwater
  2. 2. A kitchen device that uses electromagnetic radiation to cook food
  3. 3. What separates the colours of white light
  4. 6. The name of the first cloned mammal