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If a planet was completely covered in water, wouldn't it all be freshwater?
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this post was submitted on 20 Oct 2024
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Very true, but I think the root of their question is: if there was no land above the surface, would the oceans be salty to begin with?
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.