Energy Crossword Puzzle

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Across
  1. 2. third step of coal formation
  2. 7. energy that will run out
  3. 9. energy is created, such as oil or coil
  4. 10. mining with mountaintop removal, strip mining
  5. 13. first step of coal formation
  6. 14. percent of USA wold energy consumption
  7. 15. quantitative property that must be transferred to an object in order to perform work on
Down
  1. 1. energy is created naturally, for example by movement
  2. 3. country where most of Ecuador's oil goes
  3. 4. mining with minimal effects on the surface, solid degradation
  4. 5. sector that most energy consumes
  5. 6. most concentrated coal
  6. 8. economies that most energy consumes
  7. 11. most abundant fossil fuel
  8. 12. energy that will not run out