World Geography
The sidereal month may be defined as

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
the period of rotation of moon
None of these

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World Geography
The sequence of layers of atmosphere from earth to upwards is

troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, ionosphere(thermosphere, thermopause, exosphere)
troposphere, stratosphere, stratopause, mesosphere , ionosphere
troposphere, tropopause, stratosphere, mesosphere , exosphere, thermosphere, thermopause
troposphere, tropopause, stratosphere, thermosphere, exosphere

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