Across
- 4. Water vapor used in turbines
- 5. Industrial facility
- 7. Related to renewable energy
- 8. Organic matter used as fuel
- 10. Related to biogas source
- 12. Our planet
- 13. Used in geothermal systems
- 16. Gas produced from organic waste
- 19. Naturally replenished energy
- 21. Ability to generate electricity
Down
- 1. Element in greenhouse gases
- 2. Pollution-free energy
- 3. Moving air energy
- 4. Energy from the sun
- 6. Device to move fluids
- 9. Source of solar energy
- 11. Heat energy from inside Earth
- 13. Form of thermal energy
- 14. Rotating machine used to generate power
- 15. Tank for biogas production
- 17. Capacity to do work
- 18. Fuel in gaseous form
- 20. Type of energy (electric form)