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

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

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World Geography
The Penumbra is

None of these
the outer portion of the moon's shadow
formed by the tangent that intersects between the sun and the moon
both (a) and (b)

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World Geography
The three recognized major fishing grounds of the world are located in the

one in the southern hemisphere only and two in the northern hemisphere
two in the southern hemisphere only and one in the northern hemisphere
southern hemisphere only
northern hemisphere only

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