World Geography
The most recent and logical concept regarding the origin of ocean basins and continents is that of

continental data
conventional current
cooling process
plate tectesic

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World Geography
The Penumbra is

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

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World Geography
The sidereal month may be defined as

None of these
the period in which the moon completes an orbit around the earth
the period of rotation of moon
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky

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