World Geography
The variation in the duration of the day and the night is due to earth's

both (a) and (b)
revolution around the sun
rotation on its axis
inclination of an angle of 601/2 degrees

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World Geography
The Harmattan is

All of these
wind that blows during the dry season from December to February
tertiary wind that carry great quantities of fine dust from the Sahara
cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the Af

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World Geography
The Penumbra is

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

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