Across
- 1. The other ingredient in hydrogen fuel cells
- 8. Heat from the Earth's interior
- 10. The original source of energy in wind and water
- 11. Chemical compounds that have carbon hydrogen atoms
- 17. Why nuclear fission is not used
- 19. An advantage of hydrogen fuel cells
- 20. Something that provides energy
- 21. A disadvantage of wind energy
- 24. A limitation of solar energy
- 26. A disadvantage of hydrogen fuel cells
- 28. The element used in nuclear energy
- 29. The two types of nuclear energy are fission and
Down
- 2. A mixture of gas and alcohol
- 3. A disadvantage of biomass
- 4. A disadvantage of solar energy
- 5. Something that can not be replenished in a short amount of time
- 6. Oils main use
- 7. Compounds made from oil
- 9. An advantage of biomass
- 12. An advantage of hydro power
- 13. An advantage of geothermal
- 14. One need for fuel
- 15. An advantage of wind energy
- 16. Something that can be replenished in a relatively short amount of time
- 18. A process where crude oil is made into other fuels
- 22. A disadvantage of geothermal
- 23. The three main types of fuel are coal, oil and
- 25. Wood, plants, manure and food wastes used for fuel
- 27. An advantage of solar energy