When do ocean freeze?

Question

When do ocean freeze?

Answer 1

When temperature drops. It's obvious.

Answer 2

When it is 30 degrees or below.  the salt does not freeze, that is why there are icebergs.

Answer 3

when it gets snowin degrees or below but the salt in the water wont freez so only some parts of the water freezes and that is why there are ice glaciers

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Answer 4

itz salt freeze not ocean in general ocean freezebelou 5 degree as there is not only one kind of salt present.