Question

why the sea and ocean is salty​

Answer 1

Answer:

Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks.

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Answer 2

$\bold{\boxed{Answer}}$

Salt in the sea, or ocean salinity, is mainly caused by rain washing mineral ions from the land into water. Sodium and chloride, the main constituents of the type of salt used in cooking, make up over 90% of all the ions found in seawater.