Across
- 4. Natural feature used to capture geothermal energy.
- 7. Thermal energy stored in the earth.
- 8. Energy from animal and plant waste.
- 11. Liquid fuel derived from biomass.
- 13. Adjective for wind and solar energy.
- 14. System combining two energy sources like solar/diesel.
- 15. Another term for eco-friendly energy.
Down
- 1. Energy produced using the movement of water.
- 2. Air pollution caused by combustion byproducts.
- 3. Acidic _____ caused by fossil fuel pollution.
- 5. Traditional fuel source that releases toxic gases.
- 6. Resources available in unlimited supply.
- 9. Primary source for solar panels.
- 10. Energy created by utilizing ocean tides.
- 12. Energy from ocean surface vibrations.