Salinity in the sea
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refers to the concentration of dissolved salts in the water. This salinity varies depending on factors such as evaporation, precipitation, and river runoff. The average salinity of seawater is around 3.5%, meaning that for every 1,000 grams of water, there are 35 grams of dissolved salts. The most common salts found in seawater are sodium chloride (table salt), magnesium chloride, and sulfur compounds. Salinity is an important factor in oceanography as it affects the density of water, which in turn influences ocean currents and circulation. It also plays a role in the distribution of marine life and the formation of sea ice.