Energy Crossword

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Across
  1. 2. Any material that can be converted to energy
  2. 4. Educated guess
  3. 5. Electric current used as a power source
  4. 6. Energy sources that cannot be used up
  5. 9. gas Used as a fuel, primarily methane, occurs naturally in the earth
  6. 10. Burning
  7. 11. Produced from natural gas or biomass
  8. 12. Energy source replenished continuously in nature
  9. 14. diesel Can be used as a neat fuel
  10. 17. fuels Fuels made from biomass
  11. 18. A machine used to convert mechanical energy to electric energy
  12. 19. The ability to do work
Down
  1. 1. value The maximum amount of energy that is available from burning a substance
  2. 3. fuels Formed in the ground after millions of years by physical and chemical changes
  3. 4. power Generating electricity using falling water
  4. 7. Energy source that cannot be replenished in our lifetime
  5. 8. Capable of decomposing naturally under natural conditions
  6. 13. Plant materials and animal waste that can be used as a fuel source
  7. 15. Grain alcohol
  8. 16. A general class of hydrocarbons, used interchangeably with the term ethanol