MINING (<_>)

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Across
  1. 3. used for gas pipes
  2. 5. used for foods
  3. 8. mostly used for aircraft
  4. 10. mostly used for jewelry
  5. 11. mostly used for tokens or coins
Down
  1. 1. used too power big machinery
  2. 2. used for battery
  3. 4. a chemical used to purify Gold
  4. 6. used for aircraft,transport machines.
  5. 7. worlds most strongest material
  6. 9. a strong metal used for strong purposes