energy sources crossword puzzle

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Across
  1. 2. is more efficient than energy.
  2. 4. use wood to heat houses
  3. 9. is fine and good in biomass
  4. 11. is not a noisy energy source
  5. 13. is dangerous for transportation
  6. 14. is a light weight energy source
  7. 15. is a renewable source.
  8. 16. energy source is free
  9. 18. generates the most electricity from geothermal energy.
  10. 20. is renewable as long sun is shining
  11. 22. has 26% in industry
Down
  1. 1. needs drilling sometimes from the earth to get energy
  2. 3. is bad for solar energy source
  3. 5. turbines harm animals
  4. 6. is a way to save energy
  5. 7. are large land for windfarms.
  6. 8. fuels energy source makes fuel cells
  7. 10. and alcohol mixed is gashol
  8. 12. is mainly used for exporting
  9. 17. resources are harmed in hydropower source
  10. 19. is the percentage of coal mined in United States is exported
  11. 21. the process of hydrogen atoms combining to form helium atoms