Across
- 4. energy that is produced by moving water
- 5. main rotor generator on top of a tower
- 9. intake structure that controls water flow
- 11. naturally from livestock, manure, and rice fields
- 12. artificial lake created by a dam
- 13. high tide and low tide can be used
Down
- 1. cars that plug into a power source and charge
- 2. energy production by using biological materials
- 3. hydrogen/natural gas blend
- 6. fuel efficiency is key
- 7. disruption of ecosystem
- 8. can be non renewable if over-used
- 10. energy generated by heat stored beneath the Earth