What is the source of most of the salt in the oceans? Human activities adds salt into the ocean, rivers and streams carry sediment containing salt to the ocean, marine fish produce salt adding it into the ocean, or wind blows salt into the ocean?

alt 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. ... Ocean water seeps into cracks in the seafloor and is heated by magma from the Earth's core. The heat causes a series of chemical reactions.