A submerged (drowned) coastline, formed by past sea level rise or land subsidence relative to sea level, will continue to be modified by coastal erosion processes (wave action straightening/smoothing the irregular drowned coastline) even if sea level itself stops changing.
Even without further change in mean sea level, an already-submerged (drowned) coastline remains geomorphologically unstable and will be progressively modified by wave erosion, which straightens...
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