Across
- 5. naturally occurring elements found in rock
- 7. a solid, black, flammable fossil fuel
- 8. cannot be replaced in a short amount of time
- 10. resources materials on earth
- 11. to use something again for a similar purpose
Down
- 1. a clear, flammable gas fossil fuel
- 2. replaced in a short amount of time
- 3. remains of ancient plants and animals
- 4. to use less of a material
- 6. using materials more than once or in a different way
- 9. a thick liquid, flammable fossil fuel