Across
- 1. tunnels that haven't been properly secured
- 4. waste can cause serious environmental damage
- 5. easily transportable
- 8. regularly dangerous to mine for
- 10. removing coal from the ground and taking it somewhere else
- 12. for heating in home fracking dangers still unknown
- 13. easily transportable
- 14. Process of extracting materials from the earth
Down
- 2. very small amount needed
- 3. can cause environmental damage
- 6. the natural state of commodities
- 7. used around the world dangerous to work on
- 9. gas: highly abundant
- 11. working without control