Across
- 2. Using the wind to generate electricity
- 4. Fuels produced from living organisms
- 7. Used for making batteries
- 9. Fuel formed by decomposition of buried dead organisms
- 11. Precious metal used to make jewelry
- 12. Energy of electromagnetic waves
- 15. Used for electric wiring
- 17. Using water to generate electricity.
- 18. Yellow-to-black liquid found beneath the Earth's surface used to make fuel
- 20. A colorless, odorless, tasteless, gaseous mixture of nitrogen and oxygen in the Earth's atmosphere
Down
- 1. Wood used as a building material
- 3. A form of hydropower that converts the energy of tides into useful forms of power
- 5. A fuel that provides nuclear energy
- 6. The transport of energy by ocean surface waves
- 8. Precious metal used to make coins
- 10. Using the sun to generate heat, light, hot water or electricity
- 13. Using the natural sources of heat inside the Earth to produce heat or electricity
- 14. Energy from plants and plant-derived materials
- 16. Dark brown to black graphite like material used as a fuel
- 19. Used to make cans
