does fresh water have lower salinity and density?
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salt makes sea water more dense than freshwater. salty water needs to be colder than a fresh water before it freezes.
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Salt water is more dense than fresh water
Increasing the mass by adding salt increases the density. Seawater is a little bit more dense than fresh water so it sinks beneath freshwater. This means that when rivers flow out into the sea the river freshwater floats on top of the sea water.
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