World Geography
The temperature needed to keep the earth's surface and the atmosphere in thermal equilibrium is called

global temperature
the mean global surface temperature
the surface temperature
equilibrium temperature

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World Geography
The sidereal month may be defined as

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

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