World Geography
The most densely populated regions in the world are

the summer climatic regions
the equatorial regions
the monsoon climatic regions
the hot desert climatic regions

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World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the earth
the period of rotation of moon
None of these
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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