A mechanical wave is created when a source of energy causes a vibration. Vibration causes disturbance in system.
A mechanical wave is a wave that is caused by the oscillation of matter and so conveys energy through a medium.
When an energy source causes a vibration to propagate across a medium, it is called a mechanical wave.
A mechanical wave is a type of wave in which the medium's vibration is perpendicular to the wave's travel direction.
Hence, vibration is the correct answer.
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