Where would the warmest water in the ocean be found?

the poles, on the surface

the poles, deep below the surface

the equator, deep below the surface

the equator, on the surface

Option (4)

Explanation:

The earth receives the highest amount of sunlight and rainfall in the region of the equator as the sun is directly incident over this region. So the upper surface portion of the water bodies located in this region gets heated up to a maximum point, due to which the temperature of the water increases, in comparison to the tropical, temperate and polar region. With the increasing depth, the temperature of the water decreases, and as this region is the hottest of all, so the warm water exists up to a larger depth, compared to the other region.

So, at the equator, on the surface of the ocean, there occurs the warmest water.

Thus, the correct answer is option (4).

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.