GEOLOGY

Detailed explanation-1: -Most of them get there from rivers carrying chemicals dissolved out of rock and soil. The main one is sodium chloride, often just called salt. Most seawater has about 35 g (7 teaspoons) of salt in every 1, 000 g (about a litre) of water.

Detailed explanation-2: -Salinity is amount of salt present in 1000 grams of water. The average salinity of the oceans is 35 parts per thousand.

Detailed explanation-3: -The concentration of salt in seawater (its salinity) is about 35 parts per thousand; in other words, about 3.5% of the weight of seawater comes from the dissolved salts.

Detailed explanation-4: -For example, 35 parts per thousand salinity represents 35 grams of salt in 1000 grams of solution.

Detailed explanation-5: -Ocean water has a salinity of about 3.5% salt. This means that in a 100gm solution of salty water, there is 3.5 grams of salt. Or, put another way, one litre of seawater contains 35 grams of salt-that is approximately six teaspoons.