Across
- 3. Energy from a nuclear reaction
- 6. A resource that will never run out
- 8. Carbonized fossil fuel
- 10. H2O
- 13. Energy from moving air
- 15. Powered by the sun
- 16. The perservation of natural resources
- 17. Decayed animals in the soil
Down
- 1. Surrounding conditions
- 2. Wood and solar energy
- 3. Gas and Oil
- 4. Heat from the interior of the earth
- 5. Fuel from organisms preserved in rock
- 7. Colorless, odorless gas
- 9. Fossil Fuel in gas form
- 10. What a tree is made of
- 11. Naturally occurring element
- 12. Mud or clay by a river
- 14. Consisting of grains of rock
- 16. Dark oil made of hydrocarbons