WHY can the color of the seas and oceans vary, even in areas close to each other?

Pure water looks bluish, but organic and less often inorganic impurities can change the color of seawater. Many single-celled algae secrete substances whose molecules contain chromophores – groups of atoms that selectively absorb and scatter certain colors.

Even small variations in water temperature and salinity due to currents, bottom topography, the presence of nutrients greatly affect the life cycle of chromophore sources.

Rivers also carry water colored by suspended particles of clay and organic matter into the sea.

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