Iron Crossword

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Across
  1. 3. The type of steel used to make cutlery and surgical instruments
  2. 6. Environmental cost of smelting iron caused by carbon dioxide gas (6,7)
  3. 7. A rock that contains a useful metal compound
  4. 8. Environmental cost of smelting iron caused by sulphur dioxide gas (4,4)
  5. 9. A yellow metal commonly found as a native metal
  6. 10. Process of losing electrons
  7. 13. The iron ore containing Fe3O4
  8. 15. Process of gaining electrons
Down
  1. 1. The iron ore containing Fe2O3
  2. 2. The element in steel other than iron
  3. 4. A poisonous gas and reducing agent in the blast furnace (6,8)
  4. 5. When a protective coating of zinc is used to protect iron from rusting
  5. 11. Oxidation is the gain of ...
  6. 12. The carbon containing substance burned in a blast furnace
  7. 14. Hydrated iron oxide