World Geography
The Penumbra is

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

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World Geography
The temperature inversion is

All of these
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
when the decrease in temperature or moisture or both takes place
whenever the normal decrease of atmospheric temperature

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World Geography
The modern theory of plate tectonics states

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
All of these

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