Across
- 1. energy that comes naturally
- 5. a hard black solid fuel
- 7. the electromagnetic radiation emitted by the sun
- 8. harmful or unwanted material
- 9. the splitting of uranium atoms to release energy
- 11. a flammable yellow and black substance
- 12. heat deep in the earth's surface
- 14. could be plant material
- 15. natural resource that cannot be replaced
Down
- 2. disposal site of waste
- 3. water powered energy
- 4. fuels a fuel formed over a very long time
- 6. a gas found in the ground
- 10. the ability to change
- 13. turbines harness wind