crossword

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Across
  1. 2. What percent of the USA coal is exported
  2. 3. a limitation to solar energy
  3. 5. Compounds that make up oil
  4. 6. oil When fuel is pumped from the ground
  5. 7. What is oil mainly used for
  6. 10. What gas is emitted from cars
  7. 12. Since fossil fuels take hundreds of millions of years to form they are considered
  8. 16. why inset hydrogen used commonly used
  9. 19. Movement of electrons
  10. 20. how does a meltdown occur
  11. 21. what is the most efficient energy source
  12. 22. is the least used energy
  13. 24. What is coals main use
Down
  1. 1. when atoms fuse
  2. 4. Turns a turbine
  3. 8. the prosses to make oil
  4. 9. kinetic friction
  5. 11. fuel formed by mixing gasoline and alcohol
  6. 13. central core of an atom
  7. 14. is bio mass renewable
  8. 15. comes from digging deep in the ground
  9. 17. wood plant manure waste
  10. 18. Why inset fusion commonly used today
  11. 23. Name a type of fossil fuel