Editing Coast (section)

===Cliff erosion===
* Much of the sediment deposited along a coast is the result of erosion of a surrounding [[cliff]], or bluff. [[Cliffed coast|Sea cliffs]] retreat landward because of the constant undercutting of slopes by waves. If the slope/cliff being undercut is made of unconsolidated sediment it will erode at a much faster rate than a cliff made of bedrock.<ref name=":2" />
* A [[natural arch]] is formed when a headland is eroded through by waves.
* [[Sea cave]]s are made when certain rock beds are more susceptible to erosion than the surrounding rock beds because of different areas of weakness. These areas are eroded at a faster pace creating a hole or crevice that, through time, by means of wave action and erosion, becomes a cave.
* A [[stack (geology)|stack]] is formed when a headland is eroded away by wave and wind action or an arch collapses leaving an offshore remnant.
* A [[Stack (geology)|stump]] is a shortened sea stack that has been eroded away or fallen because of instability.
* Wave-cut notches are caused by the undercutting of overhanging slopes which leads to increased stress on cliff material and a greater probability that the slope material will fall. The fallen debris accumulates at the bottom of the cliff and is eventually removed by waves.
* A [[wave-cut platform]] forms after erosion and retreat of a sea cliff has been occurring for a long time. Gently sloping wave-cut platforms develop early on in the first stages of cliff retreat. Later, the length of the platform decreases because the waves lose their energy as they break further offshore.<ref name=":2" />{{clarify|what makes the platform get shorter?|date=April 2024}}