World Geography
The Harmattan is

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

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

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

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