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Across
  1. 3. length of a wave
  2. 5. the highest point of a wave
  3. 6. solid, liquid, or gas
  4. 8. low density
  5. 9. the height of a wave
Down
  1. 1. a movement of energy
  2. 2. a unit of measurement for frequency
  3. 4. the lowest point of a wave
  4. 5. high density
  5. 7. how frequent waves appear