Sea, according to history, was formed 4,4 bilion years ago when earth's atmosphere is covered by volcanic dust which resulted in obstruction of sunlight to enter the earth. impact, moisture in the athmosphere from condensing and forming rain. Then rain fills the basin until formed the ocean.
At first, the sea is highly acid (with temperature around 100°c) it cause by the high temperature condition and atmosphere earth situation is filled with carbon dioxide. at that moment the tsunami oftenn occure because of frequent asteroid hit the earth accompanied by the phenomenon of tidal sea water so quickly happens because the distance of the moon is so close to the earth.
Then gradually the amount of carbon dioxide in the atmoshpere began to decrease due dissolved in sea water and react with carbonate ion to form calcium carbonate, impact the sky began to be clear so that sunlight can shine back into the earth and resulted in evaporation process so that the volume of sea water on earth is also experiencing a reduction and the parts of the earth which was initialy submerged in the water began to dry. rock weathering process continues due to rains that occured and was carried into the ocean, this is what causes the sea water is increasingly salty.
For example: separation of the Americas from Europe and Africa
(source: kaskus.us)
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