Across
- 7. another name for oil
- 8. nuclear energy does not produce air pollution, but it produces this type of waste
- 9. a resource that will eventually run out
- 11. formed over millions of years from dead plants and animals
- 13. a resource that is replaced by nature in our lifetime
Down
- 1. energy that comes from heat deep within the Earth
- 2. energy from water running through a dam
- 3. this type of energy comes from sunlight
- 4. the type of cell that collects solar energy
- 5. electricity from wind is generated when the wind turns this
- 6. this form of energy comes from recently dead plants and organic waste
- 10. energy released by splitting atoms
- 12. Oil is made over millions of years from materials originating in this type of Earth's environments