World Geography
The modern theory of plate tectonics states

All of these
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid
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

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World Geography
The Penumbra is

both (a) and (b)
the outer portion of the moon's shadow
None of these
formed by the tangent that intersects between the sun and the moon

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