Across
- 3. energy type that will never run out
- 4. a mechanical device that rotates to generate electricity
- 5. energy type that will eventually run out
- 8. refers to the gradual increase of the average temperature on Earth
- 12. energy resource that forms over millions of years from the remains of organisms
- 13. energy created by flowing water
- 15. the primary radioactive material used in nuclear power plants
- 16. energy type that comes from radioactive materials
- 18. the most abundant greenhouse gas in the atmoshpere
Down
- 1. a substance that traps heat on the planet
- 2. liquid fossil fuel
- 6. energy harnessed by growing organisms
- 7. refers to the gradual change in long term weather patterns on the planet
- 9. energy harnessed from Earth's interior heat
- 10. energy type that comes from the sun
- 11. solid fossil fuel
- 14. type of energy created from moving air
- 17. material that humans need such as land, air, and water
- 19. gaseous fossil fuel