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: '''P-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 [[P-wave]]s at different locations on [[Earth]] during an [[earthquake]] and this information can be used to determine the structure of the [[Earth]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''P wave, pages 210-11, GCSE Physics; Student Book, Collins, AQA '']