1. Hydrothermal vents: These are cracks in the sea floor where hot water from the Earth's interior mixes with cold ocean water. The hot water leaches minerals from the rocks beneath the sea floor, including salts. These salts are then released into the ocean water.
2. Rivers and streams: Rivers and streams carry dissolved salts from the land into the ocean. These salts come from the weathering of rocks and soils, as well as from human activities such as agriculture and mining.
