Why Is the Ocean Salty? Rivers Keep Adding Freshwater

Why is the ocean salty when rivers constantly pour freshwater into it? Every day, rivers deliver enormous quantities of freshwater to the sea, yet seawater remains about 3.5% dissolved salts. This documentary uncovers the hidden geological and chemical processes that solve one of Earth's most overlooked mysteries. We trace the surprising journey of water and minerals through weathering, river transport, evaporation, seafloor reactions, and biological activity. You'll discover why freshwater is never truly mineral-free, how hydrothermal vents both add and remove chemicals from seawater, and why the ocean is not a simple bucket filling up with salt. The answer reveals a planet where water and dissolved substances follow completely different paths over vastly different timescales. If this changed how you see the ocean, hit like, share your thoughts in the comments, and subscribe for more hidden stories behind everyday science. #oceanscience #earthscience #whyistheoceansalty