World Geography
The Penumbra is

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

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

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

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