World Geography
The Penumbra is

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

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
infrared rays from the sun
ultraviolet rays from the sun
None of these

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