Waves occur in the sea. The frictional drag between the sea and the wind causes turbulence with the waves and eddying. This creates high pressure areas called troughs, and high pressure areas called crests.
| Graph IRI | Count |
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| http://dbkwik.webdatacommons.org | 4 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
