Nonrenewable Energy Crossword.

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Across
  1. 2. Nuclear fuel that can no longer produce enough heat to be useful
  2. 3. Hydraulic fracturing
  3. 6. By producr of all combustion, from biofuels
  4. 7. Also Known as Hard coal
  5. 8. Contains 80 to 95% methane and 5 to 20% ethane, propane,butane
  6. 9. Contains 78% nitrogen
  7. 12. Maximum electrical output
  8. 14. Generated from nuclear energy in nuclear fuel
  9. 15. Heated in absence of oxygen
  10. 16. A Brown coal, soft sedimentary rock
  11. 17. Solid fuel preserved 280 million years ago
  12. 18. Alcohol made by converting starches and sugar
Down
  1. 1. Old Carbon contained fossil fuels
  2. 4. Emits alpha or beta particles
  3. 5. Also Known as oil sands
  4. 10. Black or dark brown coal
  5. 11. Liguid fuel created from refined biomass
  6. 12. Exists in a liguid state underground
  7. 13. A precursor to coal
  8. 17. Colorless, odorless gas