Energy

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