Treasures of the Earth

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Across
  1. 5. The place where most elements come from
  2. 7. A stable subatomic particle with no charge
  3. 8. Metal that does not rust. Near-perfect reflector of thermal infrared light.
  4. 10. A stable subatomic particle with a charge of negative electricity
  5. 13. Mineral that turns flame green and contains copper within it
  6. 17. Weakens metal. Removed from metals when they are smelted.
  7. 19. Another name for uncured silicone.
  8. 20. One of the world's strongest alloys. Carbon is needed to produce this metal.
Down
  1. 1. A stable subatomic particle with a charge of positive electricity
  2. 2. reaction where two or more atomic nuclei are combined to form one or more different atomic nuclei
  3. 3. Referred to as "Treasures of the Earth"
  4. 4. Copper and tin combined to make stronger and sharper weapons of this material.
  5. 6. Needed to free copper from oxygen. This element is provided by charcoal.
  6. 9. Atomic number 26 on the Periodic Table. Its discovery led to the Industrial Revolution.
  7. 11. Atomic number 29 on the Periodic Table. Discovered in fire from burnt Malachite.
  8. 12. Nest China's national stadium. Built with steel in an elaborate design.
  9. 14. Smallest unit of mass; makes up elements
  10. 15. Atomic number 13 on the Periodic Table. An extremely light, flexible metal. Shares properties with steel.
  11. 16. Molecules and atoms movement speed.
  12. 18. Strongest material in the world.