A Very Merry Sound Energy Christmas

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Across
  1. 3. What is the high point of a wave called?
  2. 7. What is the number of peaks or troughs that pass by in a certain amount of time?
  3. 9. Where does Santa live?
  4. 10. Who helps Santa make toys?
  5. 14. What is the distance between two peaks or two troughs?
  6. 16. What green item do people put up at Christmas to decorate their homes?
  7. 17. What causes sound?
Down
  1. 1. What is a form of energy that comes from making noise?
  2. 2. What is the red and white striped Christmas candy?
  3. 4. What animals help to pull Santa's sleigh?
  4. 5. What is the highness or lowness of a sound?
  5. 6. What is Santa's favorite treat?
  6. 8. What do people hang in their trees to decorate them?
  7. 11. What is left under the tree on Christmas day?
  8. 12. What is the height of a wave called?
  9. 13. How does sound travel?
  10. 15. What is the low point of a wave called?
  11. 18. Who leads Santa's sleigh?