this post was submitted on 07 Feb 2024
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A coastline absolutely can vanish(submerged) or be against geography, such as rocky cliffs, that is unsuitable. "Coastlines can't stop existing, only move" is semantic nonesense.
EDIT: for ya downvoters, where's the coastline on an island that vanishes due to rising sea levels? The Marshall Islands have a max elevation of ~7' and are already having issues with rising sea levels. When the sea rises above them, where does their coastal ecosystem go?
If a coastline submerges a new coastline is created further inland. ie, it moved. Or are you proposing a situation where all land is submerged?
You’re right, a beach can be replaced by cliffs that a crocodile wouldn’t be able to make use of. That’s a good point.