energy sources

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Across
  1. 2. most popular source of non renewable energy
  2. 7. positive of non renewable energy
  3. 8. negative of of non renewable energy
  4. 10. energy from farming
  5. 13. used in steam trains as fuel
  6. 14. burnt to heat water in a boiler
Down
  1. 1. renewable energy involving air
  2. 3. positive of renewable energy
  3. 4. impact of fossil fuels
  4. 5. renewable energy involving heat fro earths surface
  5. 6. negative of renewable energy
  6. 9. least popular source of non renewable energy
  7. 11. renewable energy involving sun
  8. 12. anything moving
  9. 15. renewable energy involving water