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The correct answer is vibration. Sound waves are started by vibration. In fact, the sound is itself is a vibration. Sound travels in the form of waves that makes the sound audible to the human's ears. 

Answer: Sound waves are started by vibration.

Explanation:

Sound wave:  The Sound wave is the longitudinal wave which is the carry of sound from one point to another point.

The Sound wave moves from the back and forth vibration of the particle.

In the longitudinal wave, the particle of the medium moves parallel to the direction of motion. The longitudinal wave shows the motion of the particle.

Hence, Sound waves are started by vibration.

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