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Since this one has more marbles for each box part (4) than the first one (3), we can say that the second one is DENSER. Salinity adds to mass (no. of marbles) but not to the volume (size of box). Thus, the more salinity, the denser. Temperature may also affect water density. When the temperature is high, molecules in water disperse and move around more rapidy than they usually do in order to spread the heat energy.
It is to be noted that the variations in salinity are the result of certain physical processes like evaporation, precipitation and freezing. Salinity decreases in case fresh water is added to the ocean water. It may be through any of the processes such as precipitation, influx of fresh water by rivers, surface runoff or the melting of snow and ice etc.