Crossword 3

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Across
  1. 1. how plants eat
  2. 4. OPEC was founded here
  3. 7. refined product used for waterproofing and adhesion properties
  4. 8. newest member of OPEC
  5. 9. Used in LPG cylinders
  6. 10. exothermic hydrogen addition process
  7. 12. sedimentary rock
Down
  1. 2. measure of fuel's ability to resist knocking
  2. 3. cleaner fossil fuel
  3. 5. exhaust gas cleaning systems
  4. 6. this process releases carbon dioxide into the air
  5. 11. most widely consumed refined product