Across
- 2. chemical compounds that are derived from oil to make product
- 3. radioactive material left over from the production of energy
- 5. energy that holds these particles together in the nucleus
- 7. rock filled with mixture of hydrocarbons
- 8. small nuclei are forced together to form a heavier nucleus
- 10. the ability to do work
- 12. the practice of digging deep shafts for mineral
- 13. dark liquid fossil fuel made of hydrocarbons
- 14. the extraction of mineral by layers
Down
- 1. the splitting of an atom’s nucleus
- 4. can be replaced in a relatively short time
- 6. cannot be replaced
- 9. motion
- 11. the process in which a fuel burns