biofuels

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Across
  1. 2. -a natural cleaner-burning group of gasses
  2. 8. - process of producing energy in plants
  3. 9. - liquid fossil fuel
  4. 10. essential liquid required for photosynthesis
Down
  1. 1. - a gas, primary product of combustion
  2. 3. gas used in biofuels, produced by fermentation
  3. 4. blended gasoline and ethanol
  4. 5. necessary energy for photosynthesis
  5. 6. fossil fuel made of dead plants under anaerobic conditions under high pressure and high temperature
  6. 7. -greenhouse gas produces from decomposition of organic matter
  7. 11. - isn't limited, can be restored