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About 96.5% (by weight) of sea water is water (H2O). The remaining 3.5% is about 3.2% sodium chloride (NaCl) and 0.3% magnesium sulfate (MgSO4). Also present are small quantities of calcium (Ca), potassium (K) and bicarbonate (HCO3), and very minuscule amounts of dozens of other compounds and elements.

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16y ago

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