Across
- 2. Converts sunlight directly into electricity
- 7. Energy sources that can be naturally replaced
- 9. Machine that converts energy from wind or water into electricity
- 10. Heat energy from inside the Earth
- 11. Coal, oil, or natural gas formed from ancient plants and animals
- 14. Device that produces electricity
- 15. Organic material used for fuel
Down
- 1. Energy sources that cannot be easily replaced
- 3. Energy from flowing water
- 4. The total amount of greenhouse gases produced by human activities
- 5. Flow of electrical power or charge
- 6. Energy from splitting atoms
- 8. The process of burning fuel to release energy
- 12. Energy from the sun
- 13. Air movement used to generate power