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Compressions and rarefractions make up sound waves.

These look like squashed up coils of a spring and then stretched out coils.

Try using a slinky on the ground to show it. Grab a friend, and hold both ends of the slinky stretched across the room, then push at one end. You will see the compression move along the slinky. Do it over again rapidly and you will see the series of compressions, which mirrors the behavior of a sound wave.

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