Final answer:
The two factors that increase the density of water in the ocean are temperature and salinity. Of these, temperature can fluctuate the most and significantly impacts the density of water.
Step-by-step explanation:
The two main factors that increase the density of water in the ocean are salinity and temperature. . Of these two, the amount of water from melting glaciers and ice caps can fluctuate (change) the most. The melting of glaciers and ice caps contribute significant amounts of liquid water to the ocean, leading to an increase in its volume and density.
However, between these two, temperature fluctuates the most and can significantly affect the density. As the temperature increases, the volume of water expands, decreasing its density, and vice versa. For example, warmer ocean currents have less density compared to cooler ones.
In contrast, salinity doesn't change as frequently because it requires the addition or subtraction of salt, which usually happens over longer periods or in specific occasions like freshwater inflow from rivers, or evaporation.
Learn more about Ocean Water Density