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Exactly. If a planet ever had a salty ocean, adding more water probably wouldn't dilute it in any meaningful way, so it would need to be a planet that never had continents.
Continents and the surface are just areas of the planet that don't have water covering them up.
If Earth's oceans rose only a few miles up, it would be a water planet, but these things would still exist. Including plate tectonics and the circulation of magma / molten core.
Water circulates due to pressure, temperature, and impurities, each having their own positive feedback loop into the system before it finds a balance.
Sure but once a continental plate is flooded, isn't it by definition an oceanic plate at that point? A continent only exists if it isn't flooded.
I mean, it's basically arguing semantics, which was my point. Temperature, sediment, etc. transfer will still occur, and erosion will happen. It would just happen at different time scales.
Overall composition of a planet is what would matter, not whether there is land. If there is salt on the planet, it would almost assuredly have salty oceans. Salt diffuses in water. If you put salt into a glass of water and leave it sit, eventually the salt would dissolve and mix completely. Salt water has a different density than water. The act of dissolving involves energy changes. These create small eddies and currents that would mix the water until it was in equilibrium. If there is salt in any form on your waterworld, the only way it wouldn't be salty is if the salt was permanently separated from the water physically.