Across
- 4. GASOLINE
- 10. PETROLEUM
- 12. NATURALGAS
- 14. PLANE
- 15. URANIUM
- 17. RENEWABLE
- 18. DIESEL
- 19. HOT
- 20. HEATER
- 22. CRUDEOIL
- 23. FUELOIL
Down
- 1. STEAM
- 2. ELECTRICITY
- 3. NUCLEAR
- 5. EARTH
- 6. CAR
- 7. KEROSENE
- 8. LAMP
- 9. BARREL
- 11. MINE
- 13. GEYSER
- 16. METHANE
- 21. TRAIN
- 22. COAL