Sound waves are called mechanical waves because:

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A They can travel through a vacuum.
B They require a material medium (solid, liquid, or gas) to travel.
C They travel at the speed of light.
D They are transverse waves.

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Answer: B. They require a material medium (solid, liquid, or gas) to travel.

Explanation: Sound cannot travel through a vacuum because it needs particles to vibrate and transfer energy.

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Sound waves are called mechanical waves because:

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