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

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

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World Geography
Which kind of precipitation occurs when a front or boundary line is formed between two air masses of contrasting temperature?

Cyclonic
Frontal
Orographic
Convectional

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