Across
- 4. black or brown rock
- 7. any material made by plants and animals that can be converted into energy.
- 9. two main natural resource.
- 11. energy that comes from the earth.
- 12. we use 60% of these each day
- 13. Materials we use from nature.
- 15. liquid underground
Down
- 1. flowing water energy.
- 2. release heat energy when used to create energy and electricity formed millions of years ago.
- 3. moving air created as the sun heats.
- 5. sun has produced energy in the form of light and heat.
- 6. can always be replaced never run out.
- 8. man made
- 10. can not be replaced.
- 14. found underground and is used for fuel.