Waves

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Across
  1. 3. parallel to the direction of energy transfer
  2. 5. perpendicular to the direction of waves
  3. 7. A decrease in a density of something
  4. 9. force or power
  5. 10. low point
Down
  1. 1. distance from rest point to trough
  2. 2. the number of a complete wave passing a point in one second
  3. 4. A region where particles are closer together
  4. 6. One crest to another
  5. 8. top