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