sound energy

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Across
  1. 2. a disturbance caused by a vibration; Waves travel away from the source that makes them.
  2. 3. distance traveled per unit of time
  3. 6. a wave that occurs when the particles of a medium move parallel to the direction of the wave
  4. 9. the number of cycles a wave completes in a period of time; the number of times something happens in a period of time
  5. 10. the highest point of the wave
  6. 11. a wave that moves along the interface of two different materials
  7. 12. an object's mass divided by its volume; a measure of how many particles are packed together into a certain amount of space
Down
  1. 1. a wave that occurs when the particles of a medium are displaced perpendicularly to the direction of the wave
  2. 4. occurs when rocks are squeezed by external forces directed toward one another to put stress on the rock, acting to decrease its volume or shorten its dimensions
  3. 5. the distance between one peak and the next on a wave
  4. 7. the lowest point of the wave
  5. 8. the matter through which a wave travels