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A type of wave that does not require a medium to transfer energy. This type of wave can transfer energy through empty space or through matter.
The area in a compressional wave where there is less matter in an area as the wave passes through the matter.
The area in a compressional wave where there is more matter in an area as the wave passes through the matter.
Matter in the medium vibrates up and down at a right angles to the direction the energy is transferred.
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