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Why does ocean salinity matter? The ocean is the heart of Earth's water cycle, and changes in the rate of evaporation and rainfall are reflected in the relative freshness or saltiness of the ocean surface. In addition, differences in salinity from place to place, along with temperature, drive the currents that move heat from the equator toward the poles. Any changes in salinity and ocean currents can affect regional climates and marine life. [Source: NOAA Climate.gov]
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