Question

why ocean water is salty?

Answer 1

After years and years of river inflow and evaporation, the salt content of the lakewater 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.

Answer 2

Ocean water is salty because it contains dissolved salts and minerals in it which imparts salinity to it. Rivers fall into oceans which carry with themselves salts of soil and thus when so many rivers with soil salts fall into ocean, the sea water becomes very salty.