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

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World Geography
The period of daylight

varies with latitude and the season
is nearly constant near the equator
All of these
reaches a maximum of 24 hour in the polar zones in summer

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