HOW IS SALT FORMED IN THE SEA ? || WHY IS SEA WATER SALTY ? || SCIENCE VIDEO FOR KIDS

THIS VIDEO SHOWS HOW IS SALT FORMED IN THE SEA AND WHY IS SEA WATER SALTY .IT IS EASY AND SIMPLE TO UNDERSTAND. THIS SCIENCE VIDEO IS USEFUL FOR KIDS AND CHILDREN OF ALL GRADES.
he oceans cover about 70 percent of the Earth's surface, and that about 97 percent of water on the Earth is saline.
Salt is present in vast quantities in seawater. The open ocean has about 35 grams of SALT per liter of sea water .Salt is essential for life in general, and saltiness is one of the basic human tastes.

the rain that falls on the land is 100% fresh water , without any salt.
It mixes with carbon dioxide in the atmosphere on the way down, giving it a slightly acidic quality. Once the rain water reaches the Earth's surface, it travels over land . As it passes over the land, the acidic nature of the water breaks down rocks, and washes salt and other minerals within these rocks and get mixed with the water in the lakes , streams and rivers .the river finally carry them to the sea.

Hydro thermal vents on the ocean floor release additional dissolved minerals, including more sodium and chloride, further contributing to the briny nature of the sea.

now u will have one question in your mind.
if most of the salt in the sea comes via rivers and streams, why are rivers and streams not also salty?
they do contain salt, but the concentration is much lower about 1 gram per liter . in rivers and stream there are many outlets , so the salt out flows rather than accumulates.

in sea there is no outlet for the salt to flow , so it accumulates. so the sea water becomes very salty. there is another reason . when the sea water evaporates and goes to the sky to form clouds, the salt is left behind in the sea .It is estimated that each year four billion tons of dissolved salts are carried to the sea by rivers.

although the rivers continue to deposit new salts , the sea do not become over salty because animals and plants in the sea absorb the salts in the bodies. when they die ,they sink to the seabed and decompose into sediments.

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