Across
- 2. alternative energy that uses falling water to generate electricity
- 6. energy resources that are used faster than we can replace them
- 7. nonrenewable energy resource that uses uranium
- 9. anything used by humans that forms in nature
- 10. gaseous fossil fuel that forms from microscopic sea organisms
- 11. alternative energy that uses the ocean tides to generate electricity
- 12. disadvantage of alternative energy
- 15. energy resource that can be replaced at the rate it is used
- 16. energy resource that forms from the remains of ancient organisms
Down
- 1. using heat inside the earth to generate electricity
- 3. saving and protecting our resources
- 4. problem associated with burning fossil fuels
- 5. using living or once living materials as energy
- 8. solid fossil fuel that forms from swamp plants
- 13. cleanest type of alternative energy
- 14. liquid fossil fuel also known as oil