World Geography
The part of continental margin that is structurally a part of continent?

Continental Slope
Continental shelf
None of these
both (a) and (b)

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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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