World Geography
The main types of air mass include maritime tropical(mT) maritime polar(mP) maritime arctic(mA)continental polar(cP)

I, II
I, IV
All of these
I, II, III

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World Geography
The Penumbra is

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

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