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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.
Changes in the density set these currents in motion. Some ocean currents are set in motion by the wind. Other ocean currents are created by something. you canât see or feel. Differences in the density of water can also cause currents to form and move. Density is affected by temperature and salinity. Cold water or water with dissolved salts (higher. salinity) is denser than warm water or water without dissolved salts (low or no salinity). For. example, at the same temperature (20 o C) the density of salt water is 1.025 g/ml and fresh water. 0.998 g/ml.