compound words

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Across
  1. 1. a musical snake
  2. 6. cookie!
  3. 11. a daughter of a daughter
  4. 12. unbelievable
  5. 13. symmetry
  6. 14. a feeling
  7. 15. a flat mountain
Down
  1. 2. physical exertion
  2. 3. a friend
  3. 4. H.Q
  4. 5. a powered chair
  5. 7. a natural disaster underground
  6. 8. estimating too much
  7. 9. the space between sound and electromagnetic waves'points
  8. 10. tools to do certain things