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
What is the weight of actual amount of water vapour present in unit volume of air called?

Absolute Humidity
Relative Humidity
Specific Humidity
Condensation

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World Geography
The Penumbra is

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

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