Across
- 4. Ultimate source of energy
- 5. Has a trunk
- 6. released when atoms react
- 8. Flying mammal
- 10. Man's best friend
- 12. dark colored liquid fossil fuel
- 13. Kinetic + potential
Down
- 1. Large marsupial
- 2. replenished over short period
- 3. Likes to chase mice
- 7. heat of the Earth
- 9. cheapest fossil fuel
- 11. SI unit of energy