World Geography
The Penumbra is

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

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World Geography
The three recognized major fishing grounds of the world are located in the

one in the southern hemisphere only and two in the northern hemisphere
northern hemisphere only
two in the southern hemisphere only and one in the northern hemisphere
southern hemisphere only

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World Geography
The modern theory of plate tectonics states

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
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light

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