chemistry and its importance

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Across
  1. 4. prevents wastage of food
  2. 6. used to make diodes
  3. 7. a cheap and durable substitute for wood
  4. 9. backbone of industries
  5. 10. ____________ have superior properties than metals
  6. 11. CFC's eat away this layer
Down
  1. 1. used to kill unwanted herbs
  2. 2. study of materials
  3. 3. used to protect articles from corrosion
  4. 4. a drug used to fight against bacteria
  5. 5. metals are extracted from
  6. 8. man-made fibre