How does the sea stay salty in the water cycle?

The sea remains salty due to the continuous process of erosion and weathering of rocks on land, which release minerals, including salts, into rivers that eventually flow into the ocean. While water evaporates from the surface of the sea, leaving the salts behind, this process does not remove the dissolved salts themselves. Additionally, volcanic activity and hydrothermal vents contribute further salts to the ocean. Thus, the balance of salt input from land and geological sources, combined with the evaporation of water, keeps the ocean salty.