Posted: Jun 20, 2017 9:45 am
by Fenrir
The conjecture wasn't about whether water is denser or warmer at depth or precisely where water would freeze.

The conjecture was about what would happen if ice sank once frozen.

Ice sinking changes the entire dynamics of the system.

And that's without trying to think about other factors, like if ice sank then the density of water most likely wouldn't be highest at 4C like it is and the effects that would have.