World Geography
The relative abundance of dissolved salts in seawater in descending order is as follows

chlorine, sodium, magnesium, calcium, potassium, sulphate
chlorine, magnesium, calcium, sodium, potassium, sulphate
chlorine, sodium, sulphate, magnesium, calcium, potassium
sodium, chlorine, magnesium, potassium, sulphate, calcium

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