World Geography
The sidereal month may be defined as

None of these
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

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World Geography
The modern theory of plate tectonics states

the creation of oceanic crust and the drifting of continents
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid
All of these

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