Sound Crossword

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Across
  1. 4. When something is moving backwards and forwards it is _________.
  2. 6. The loudness of a sound.
  3. 8. The pitch produced by a bass instrument.
  4. 9. Sounds travel as these.
Down
  1. 1. These produce sounds on a guitar.
  2. 2. A whistle can produce a note with a high _____.
  3. 3. These materials have their particles close together. Sounds travel faster through them.
  4. 4. Sounds need these in order to travel.
  5. 5. The pitch produced by a small bird singing.
  6. 7. What you use to hear sounds.