Forms of energy

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Across
  1. 4. baby
  2. 5. female
  3. 7. error
  4. 9. leave
  5. 10. author
  6. 12. rock
  7. 14. close
  8. 16. empty
  9. 17. quiet
Down
  1. 1. superior
  2. 2. join
  3. 3. untrue
  4. 6. below
  5. 8. stable
  6. 10. damp
  7. 11. sick
  8. 12. choose
  9. 13. forever
  10. 14. begin
  11. 15. simple