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===About Longitudinal Waves===
There are two [[longitudinal]] [[wave]]s you should know:
*[[Sound]] - [[Wave]]s of [[Compression Wave|compression]] and [[rarefaction]] which travel through [[matter]].*[[P-wave]]s - [[Seismic Wave]]s known as [[P-wave|primary waves]] which are [[wave]]s of [[Compression Wave|compression]] through the ground during an [[earthquake]].