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Q. What is the average salinity of sea water?
Answer: 35 parts per thousand
Notes: The salinity of ocean water is a measure of the concentration of dissolved salts, which are mostly – sodium chloride but also include salts containing magnesium, sulfur, calcium, and potassium.
The average salinity of seawater is about 35 parts per thousand

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Question Number: 28 in Oceanography - Ocean Temperature, Density, Salinity in above course in App.