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: '''S-waves''' are [[refract]]ed as they move through the [[Earth]] because different layers of the [[Earth]] have different [[density]].
: [[Seismic Wave|Seismic]] detectors can be used to observe [[S-wave]]s at different locations on [[Earth]] during an [[earthquake]] and this information can be used to determine the structure of the [[Earth]].
: [[S-wave]]s do not travel through the [[Earth's Core|core]] of the [[Earth]] which is [[Scientific Evidence|evidence]] that the [[Earth's Core|core]] must be a [[liquid]].