Water salinity decreases mainly due to freezing and dilution from rivers. When water freezes, the salt is excluded from the ice, resulting in a lower salinity in the surrounding liquid water. Additionally, freshwater from rivers and rainfall dilutes seawater, further reducing its salinity.
The other options—such as high winds, heat, cooler water, and increased depth—are less directly related to decreasing salinity. While evaporation can increase salinity by concentrating salt, cooler water and increased depth do not inherently decrease salinity.
Thus, the correct answer is freezing and dilution from rivers.
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