The sea refers to a large expanse of saltwater that is part of the global hydrosphere. Physically, these bodies of water are characterized by significant salinity, variable temperature gradients, and complex bathymetry. Oceanographic processes, including the action of tides, currents, and wind, drive the mixing of water masses, distributing heat and nutrients across vast distances. These deep-water systems play a critical role in regulating global climate patterns and acting as major reservoirs for biogeochemical cycling, particularly concerning carbon and oxygen distribution among the Earth's major systems. The chemical composition of the sea is primarily dictated by dissolved mineral salts and dissolved gases, which fluctuate based on biological activity and physical exchange with the atmosphere.