Across
- 3. Increased pressure or injections needed to remove oil
- 4. Dark liquid fossil fuel made up mostly of hydrocarbon
- 6. Primarily methane gas with small amounts of other gases mixed in
- 7. Underground shafts are dug to access coal under Earth’s surface.
- 10. Cannot be replaced in a reasonable time
- 12. Energy associated with an object's motion
- 13. Kinetic energy of atoms and molecules
- 14. Potential energy stored in molecular bonds
- 15. Joining two atomic nuclei to form one nucleus
- 17. Nearly always available or replaceable in a relatively short time;
- 18. Energy associated with an object's position
Down
- 1. Potential energy stored by forces that hold atomic nuclei together
- 2. Kinetic energy that travels as waves
- 5. Oil flows out of the well, because it is already under pressure
- 8. Energy associated with the motion and position of an object; can be kinetic or potential
- 9. Overlying rock and soil are removed to access coal (safer for miners).
- 11. Associated with electric charges; can be kinetic or potential
- 16. Formed from plant remains subjected to high heat and pressures over millions of years