Metal

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Across
  1. 5. a small very thin metal object, with a point
  2. 7. a hard white metal used in stainless steel
  3. 8. not hard or firm
  4. 9. relating to tension
  5. 11. changes the level of hardness
  6. 14. a chemical element
  7. 15. to join together by heat
Down
  1. 1. what we breathe
  2. 2. a hard grey metal used to make alloy steels
  3. 3. from the Latin word for iron
  4. 4. a rare metal found naturally on earth
  5. 6. a reddish, brown flaking coating
  6. 10. comes from ore
  7. 12. a metal made by combining two or more metallic elements
  8. 13. solid and firm