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As a sound wave passes through the air, what happens to the molecules in the air?

They move up and down.
They are unaffected by the sound wave.
They travel along with the sound wave.
They move back and forth.

As a sound wave passes through the air, the molecules in the air move back and forth in the same direction as the sound wave, compressing and expanding the air as they move. This creates areas of high pressure (compressions) and low pressure (rarefactions) that travel through the air as the sound wave propagates. So the answer is "They move back and forth".