Why ocean salty?

Someone ask: Why ocean salty?

Ocean salty because rain and rivers wash tiny bits of rock into sea all time. Rocks on land break down, and water pull salt minerals loose, like spear scraping meat from bone. Rivers carry those bits to ocean. Sea water also lose pure water to sky by sun, but salt stay behind, so ocean get saltier and saltier like pot on fire when water boil away. Undersea vents at deep bottom also add more minerals from hot rock. Ocean not get endless saltier forever because some salt get trapped in sea floor and made into new rock. Cave wisdom: sea is giant bowl where earth’s salts collect, but bowl also hide some away.