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

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

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World Geography
The modern theory of plate tectonics states

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

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