Energy Crossword Puzzle

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Across
  1. 2. chemical
  2. 4. sound
  3. 8. electrical
  4. 9. energy
  5. 11. elastic
  6. 13. heat
  7. 14. mass
  8. 15. kinetic
  9. 16. mechanical
Down
  1. 1. thermal
  2. 3. conservation
  3. 5. velocity
  4. 6. nuclear
  5. 7. potential
  6. 10. gravitational
  7. 12. light