Across
- 2. A type of gas.
- 3. Uses water to generate energy.
- 5. big fan moving
- 7. Opposite of #4.
- 10. Solid energy source.
- 11. This can harm the earth and is a type of #7
- 12. Uses the sun.
Down
- 1. Uses the earth's core to generate electricity.
- 4. Used infinitely.
- 6. Natural fuel for cars.
- 8. acts as a reliable and dense power source
- 9. Material made from plants and animals.