Across
- 5. Gas from decomposing organic matter
- 8. Energy that does not pollute the air
- 10. Energy source that will eventually run out
- 12. Heat energy from beneath Earth’s surface
- 14. Structure used to hold back water
- 15. Area of geothermal activity
- 16. Machine that converts motion into electricity
- 17. Organic material used as fuel
Down
- 1. Clean alternative fuel element
- 2. Energy from ocean movement
- 3. Flat open areas where wind farms are common
- 4. Fuel made from corn or plants
- 5. Fuel made from vegetable oil
- 6. Device used to capture wind energy
- 7. Energy source that naturally replenishes
- 9. Energy from the sun
- 11. Device that stores energy
- 13. Energy from moving water