Minerals in the ocean come from rocks either from runoff eroding rocks or from undersea vents https://oceanservice.noaa.gov/facts/whysalty.html https://oceanse

Minerals in the ocean come from rocks either from runoff eroding rocks or from undersea vents https://oceanservice.noaa.gov/facts/whysalty.html https://oceanservice.noaa.gov/facts/whysalty.html Since there is no outflow for these minerals the ocean has become salty over time.