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: [[Infrasound]] is any [[sound]] which is too low [[pitch]]ed to [[hear]]. Since the lowest [[frequency]] a [[human]] can hear 20Hz, then [[infrasound]] is any [[sound]] below that.
: [[Human]]s cannot [[hear]] [[frequency|frequencies]] below 20Hz because their [[Ear Drum|ear drums]] are too small.
: Large [[animal]]s such as [[whale]]s whales and [[elephant]]s elephants can [[hear]] [[infrasound]] because their [[Ear Drum|ear drum]]s are larger than [[human]] [[Ear Drum|ear drum]]s.
: [[Infrasound]] detectors can be used to track large [[animal]]s which communicate using [[infrasound]].
: [[P-wave]]s are [[infrasound]] and a type of [[Seismic Wave|seismic wave]] caused by [[earthquake]]s.
: [[Infrasound]] detectors can help locate the source of an [[earthquake]].
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Infrasound, page 109, GCSE Physics, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Infrasound, page 37, GCSE Physics; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Infrasound, pages 62-63, GCSE Physics, Pearson Edexcel '']