Across
- 2. a fossil fuel in gas form
- 4. when two nucleus combine into one
- 5. practice of saving energy
- 9. energy that comes from plants etc
- 11. to collect store and use the suns energy
- 13. practice of spending less energy
- 17. any substance at can be replaced
- 18. when a nucleus splits
- 19. an oily fossil fuel
- 21. energy harnessed by the wind
- 22. a cell that generates energy made by hydrogen
- 23. any substance that cant be replaced
Down
- 1. any substance in nature
- 3. energy from steam underground
- 6. energy produced by flowing water
- 7. the use of sunlight to heat things
- 8. a solid fossil fuel
- 10. energy made by the ocean
- 12. a nonrenewable rehysource made from atoms
- 14. oil deposited that haven't been used before
- 15. breaking the Earth's crust to collect materiels
- 16. made from dead animals
- 20. energy from the sun