Answer:
The answer is salinity because when the higher it is, the more it increases the density.
Beside temperature, salinity can make ocean water significantly denser.
"Temperature is a physical quantity that expresses hot and cold or a measure of the average kinetic energy of the atoms or molecules in the system."
"Salinity is the saltiness or amount of salt dissolved in a body of water, called saline water (see also soil salinity)."
"Seawater is a complex mixture of 96.5 percent water, 2.5 percent salts, and smaller amounts of other substances, including dissolved inorganic and organic materials, particulates, and a few atmospheric gases."
Hence, salinity make the ocean water significantly denser.
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