Forms of energy

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Across
  1. 3. fuel made from corn
  2. 4. biodegradable fuel
  3. 5. gas that is found in small quantities in the atmosphere.
  4. 8. only consists of hydrogen and carbon atoms
  5. 9. a brown deposit resembling soil
Down
  1. 1. a liquid mixture of hydrocarbons
  2. 2. electricity
  3. 6. generation of electricity using flowing water
  4. 7. the production of electric current at the junction of two substances exposed to light.