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Ocean Salinity refers to the concentration of dissolved salts in the Earth's oceans. It is typically measured in parts per thousand (ppt) or practical salinity units (psu). Salinity levels can vary throughout the world's oceans due to factors such as evaporation, precipitation, and the melting of sea ice. High salinity levels can impact ocean circulation patterns and marine ecosystems, while low salinity levels can be influenced by factors such as river runoff and ice melt. Understanding ocean salinity is crucial for studying climate change, ocean currents, and the overall health of marine environments.