Given that you know the densities of water from the two main regions where surface waters sink (look at the map of ocean thermohaline circulation in your lecture notes for the locations of these areas), you should be able to make an estimate of the potential density (i.e., the density the water would have if was brought to the surface) of the typical ocean interior (above the bottom waters, but below the surface waters).

Which TWO of the following answers are NOT correct estimates of the potential density?

Note: Selecting a wrong answer (an estimate that is actually correct) will lose marks.