Why doesn't the whole ocean freeze in the winter?
Elijah, age 6
Great question! Parts of the ocean actually do freeze in the winter but the whole ocean doesn't freeze because the ocean is always moving and distributing heat from lower latitudes to higher latitudes. All the salt in the ocean also lowers the freezing point by a few degrees.
Also, one of the unique properties of water is that when it experiences a phase transition to its solid form (ice) it actually becomes less dense. That is why ice floats.
As far as I know, your theory that the ocean doesn't freeze because of all of the sharks and turtles peeing in it has not been specifically disproven.