Across
- 4. Energy that comes from moving water
- 5. Energy that comes from moving air
- 8. The element that is mainly used during nuclear reactions
- 9. A fossil fuel that is in the form of a black liquid
- 11. Energy sources that can run out
- 16. Energy that comes from the warmth of Earth
- 17. A highly flammable fossil fuel that doesn't pollute the air
- 18. Energy sources that take millions of years to form
Down
- 1. Greenhouse gas emitted from burning fossil fuels
- 2. A device used to store solar energy
- 3. A structure used to harness the power of the sun
- 6. A structure used to harness the power of moving water
- 7. Energy that comes from splitting atoms
- 10. A fossil fuel that is in the form of a black rock
- 12. Energy sources that do not run out
- 13. A structure used to harness the power of the wind
- 14. Energy that comes from living things
- 15. Energy that comes from the sun