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

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

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World Geography
The Harmattan is

All of these
wind that blows during the dry season from December to February
cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the Af
tertiary wind that carry great quantities of fine dust from the Sahara

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