physics 206

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Across
  1. 5. finite energy source
  2. 9. byproduct of burning fossil fuel
  3. 10. takes millions of years to form
  4. 12. biofuel is made from
  5. 13. a biofuel crop used in Brazil
  6. 14. another term for crude oil
Down
  1. 1. gas used in cooking and heating
  2. 2. liquid form of biofuel
  3. 3. an effect after continuously using fossil fuel
  4. 4. biofuel produced from vegetable oil
  5. 6. derived from plant materials
  6. 7. a non-renewable energy source
  7. 8. a greenhouse gas emitted by fossil fuel
  8. 11. fossil fuel used in cars