We must first return to the origins of the creation of the Earth. Indeed the latter has begun to cool, the water in the atmosphere has been condensed. Thus its association with carbon and sulfur gave birth to acid rain that have eroded the rocks. These acid rain entrained with them the elements that are dissolved in the other salts. By runoff game rainwater is discharged into the oceans and the seas were so salty. There is another major factor in salinisation is "evaporation". This factor helps to evaporate the water without dissolved elements. The more water evaporates more salt concentration increases

Respected Dr. Mitra,

Your comment is correct for seawater salty. But one thing is that seawater for making salty, depends on evaporation. Higher evaporation makes higher salty. So small amount of minerals can make high salty seawater. 

Respected Sir,

Most of the ocean's salts are derived from gradual processes such the breaking up of the cooled igneous rocks of the Earth's crust by weathering and erosion, the wearing down of mountains and the dissolving action of rains and streams which transported their mineral washings to the sea. Some of the ocean's salts have been dissolved from rocks and sediments below its floor. Other sources of salts include the solid and gaseous materials that escaped from the Earth's crust through volcanic vents or that originated in the atmosphere.

The salinity of ocean water varies. It is affected by such factors as melting of ice, inflow of river water, evaporation, rain, snowfall, wind, wave motion, and ocean currents that cause horizontal and vertical mixing of the saltwater.

Regards,

Shankhadeep.

Sea water is 220 times saltier than the fresh lake water.

Most of the ocean's salts were derived from gradual processes --- such the breaking up of the cooled igneous rocks of the Earth's crust by weathering and erosion, the wearing down of mountains, and the dissolving action of rains and streams which transported their mineral washings to the sea --- Some of the ocean's salts have been dissolved from rocks and sediments below its floor --- Other sources of salts include the solid and gaseous materials that escaped from the Earth's crust through volcanic vents or that originated in the atmosphere.

After years and years of river inflow and evaporation, the salt content of the lake water built up to the present levels. The same process made the seas salty. Rivers carry dissolved salts to the ocean. Water evaporates from the oceans to fall again as rain and to feed the rivers, but the salts remain in the ocean.

A final process that provides salts to the oceans is submarine volcanism, the eruption of volcanoes under water. This is similar to the previous process in that seawater is reacting with hot rock and dissolving some of the mineral constituents.

http://www.utdallas.edu/~pujana/oceans/why.html

http://www.palomar.edu/oceanography/salty_ocean.htm

We must first return to the origins of the creation of the Earth. Indeed the latter has begun to cool, the water in the atmosphere has been condensed. Thus its association with carbon and sulfur gave birth to acid rain that have eroded the rocks. These acid rain entrained with them the elements that are dissolved in the other salts. By runoff game rainwater is discharged into the oceans and the seas were so salty. There is another major factor in salinisation is "evaporation". This factor helps to evaporate the water without dissolved elements. The more water evaporates more salt concentration increases

I agree with Fadel.

The Mediterranean Sea (Europe) has very high salinity cause it is  almost closed from the main ocean, and there is more evaporation than rain or extra freshwater added from rivers.

regards

stefania

As water flows in rivers, it picks up small amounts of mineral salts from the rocks and soil of the river beds. This very-slightly salty water flows into the oceans and seas. The water in the oceans only leaves by evaporating but the salt remains dissolved in the ocean. So the remaining water gets saltier and saltier as time passes. 

Salt in the ocean comes from rocks on the land. during rainfall, atmospheric carbondioxide gas (with good  solublility in water) get dissolved in the rainwater thus forming carbolic acid and making rainwater slightly acidic . When the rain erodes the rock, acids in the rainwater break down the rock. This process creates ions, or electrically charged atomic particles. These ions are carried away in runoff to streams and rivers and, ultimately, to the ocean. Though most of  the dissolved ions are used by organisms in the ocean and are removed; others are not used up and are left for long periods of time where their concentrations increase over time. Two of the most prevalant ions in seawater are Sodium and Chloride which are salty and both ions make up over 90 percent of all dissolved ions in the ocean. 

Salty because it contains sodium chloride, which is common salt. The sodium comes from minerals on the surface of the earth (such as plagioclase, second most common mineral on Earth) after it is dissolved by common water with a little acid in it. Chlorine gas comes from volcanoes on the surface or under the ocean.

Besides sodium chloride, there are other chemical compounds dissolved in the ocean, but don't taste like salt. Our blood is identical to ocean water when it was first incorporated into the bodies of animals billions of years ago.

The cure for anything is salt water: sweat, tears or the sea.

--- Isak Dinesen