Sound waves and energy

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Across
  1. 3. waves Involves the horizontal vibration of particles
  2. 4. The low point of a wave
  3. 8. The highest point of a wave
  4. 10. Regions of space where particles are bunched together
  5. 11. waves Waves that do not require a medium to travel through but can travel through matter
  6. 12. The space between the crests and troughs of a wave, and the less space, the higher the frequency, and the more space, the deeper the sound
Down
  1. 1. The height of a wave from a resting position
  2. 2. Regions of space where particles are more spread out
  3. 5. The distance between crests and troughs of a wave
  4. 6. waves Waves that involve the vertical vibration of particles
  5. 7. waves Require a medium to travel through
  6. 9. The substance or material that a sound wave travels through