World Geography
The time interval from when the given star passes directly overhead to when it next passed directly overhead, is defined as

one sidereal day
one solar day
both the terms are similar, so any of these may be used
None of these

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World Geography
The temperature inversion is

All of these
when the decrease in temperature or moisture or both takes place
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
whenever the normal decrease of atmospheric temperature

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