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Nutrients

The nutrients used as tracers in physical oceanography are essential dissolved chemicals eaten by plants in the ocean, i.e. phytoplankton. The basic nutrients are carbon, nitrogen and phosphorous, with all three having to be present for plant material to grow. Additionally, calcium and silicon are used as skeleton building materials. Micronutrients are those nutrients used in very small quantities. These are magnesium, iron, vanadium, molybdenum and selenium. Also used in small quantities but of no known value are cadmium and barium.

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