Unit 6 Review:

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Across
  1. 6. Black, sticky tar that can be refined to petroleum
  2. 7. turbine powered by the kinetic energy of a river
  3. 8. Wood, charcoal, and biofuels
  4. 9. How radioactivity decays
  5. 11. Biofuel made from corn and sugar cane
  6. 12. Lowest quality coal
  7. 13. Non-renewable, hydrocarbon energy sources
  8. 15. Highest quality coal
  9. 16. A resource with a limited, fixed amount that cannot be replaced
  10. 17. The precursor to coal
  11. 19. Splitting of a heavy, unstable nucleus to create energy
  12. 20. A resource that can be renewable if the rate of use is lower than the rate of regeneration
  13. 21. Energy from Earth’s heat
Down
  1. 1. Technique to make PPs more efficient by using energy from hot water
  2. 2. A resource that will never be depleted
  3. 3. Generating electricity by combining hydrogen and oxygen
  4. 4. Energy from the kinetic motion of the ocean’s waves
  5. 5. Device that converts sunlight into electricity via photoelectric effect
  6. 10. FF obtained through drilling and fracking; cleanest burning
  7. 14. The FF with the most CO2 and pollution
  8. 17. Using the sun directly for heat or cooking
  9. 18. Energy captured from the movement of air from uneven heating of the Earth