Editing Coastal erosion (section)

==Mechanisms==

===Hydraulic action===
[[Hydraulic action]] occurs due to the physical [[weathering]] and mechanical response when waves strike a [[cliff]] face thus compressing air in cracks on the cliff face.<ref>{{Citation |last=Keaton |first=Jeffrey R. |title=Hydraulic Action |date=2017 |encyclopedia=Encyclopedia of Engineering Geology |series=Techniques in Dentistry and Oral & Maxillofacial Surgery |pages=1 |editor-last=Bobrowsky |editor-first=Peter T. |url=https://link.springer.com/referenceworkentry/10.1007/978-3-319-12127-7_158-1 |access-date=2025-03-28 |place=Cham |publisher=Springer International Publishing |language=en |doi=10.1007/978-3-319-12127-7_158-1 |isbn=978-3-319-12127-7 |editor2-last=Marker |editor2-first=Brian}}</ref> This exerts pressure on the surrounding rock, and can progressively splinter and remove pieces. Over time, the cracks can grow, sometimes forming a [[cave]]. The splinters fall to the sea bed where they are subjected to further wave action.

===Attrition===
[[Attrition (weathering)|Attrition]] occurs when waves cause loose pieces of rock debris ([[scree]]) to collide with each other, grinding and chipping each other, progressively becoming smaller, smoother and rounder. Scree also collides with the base of the cliff face, chipping small pieces of rock from the cliff or have a [[corrasion]] (abrasion) effect, similar to sandpapering.

===Solution===
[[Dissolution (chemistry)|Solution]] is the process in which acids contained in sea water will dissolve some types of rock such as chalk or limestone.<ref>{{Cite book|url=https://books.google.com/books?id=N_pfCgAAQBAJ&q=Solution+process+in+which+acids+contained+in+seawater+rock+types+like+chalk+or+limestone&pg=PT100|title=Cambridge IGCSE® Geography Coursebook with CD-ROM|last1=Cambers|first1=Gary|last2=Sibley|first2=Steve|date=2015-09-10|publisher=Cambridge University Press|isbn=9781107458949|language=en}}</ref>

===Abrasion===
[[Abrasion (geology)|Abrasion]], also known as [[corrasion]], occurs when waves break on cliff faces and slowly erode it. As the sea pounds cliff faces it also uses the scree from other wave actions to batter and break off pieces of rock from higher up the cliff face which can be used for this same wave action and attrition.

===Corrosion===
[[Corrosion]] or solution/chemical weathering occurs when the sea's [[pH]] (anything below pH 7.0) corrodes rocks on a cliff face. [[Limestone]] cliff faces, which have a moderately high pH, are particularly affected in this way. Wave action also increases the rate of reaction by removing the reacted material.