Coal, Oil and Natural Gas

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Across
  1. 2. : A force applied during the formation of fossil fuels.
  2. 3. : Organisms that decomposed to form fossil fuels.
  3. 7. : The capacity to do work, often derived from fuels.
  4. 8. : A type of fuel derived from oil.
  5. 11. : The oldest type of coal formed under high temperature and pressure.
  6. 13. : A common product made from oil.
  7. 14. : Organic matter contributing to fossil fuels.
  8. 17. : The original source of energy stored in fossil fuels.
  9. 18. : Fuels made from decayed plants and animals that lived long ago.
  10. 20. : A liquid fossil fuel formed from the remains of simple organisms.
Down
  1. 1. : Heat conditions that influence the formation of fuels.
  2. 4. : A gaseous fossil fuel derived from simple organisms.
  3. 5. : A substance burned to release stored energy.
  4. 6. : A gas burned in most stoves and a main product of natural gas.
  5. 9. : A resource that cannot be easily replaced or reused.
  6. 10. : Simple life forms whose remains formed fossil fuels.
  7. 12. : Rock formed from compressed sediments, like coal.
  8. 15. : Recently formed coal under low temperature and pressure.
  9. 16. : A black or brown sedimentary rock formed from the remains of plants.
  10. 19. : Appliances that burn methane for cooking.