World Geography
The ratio of the weight of water vapour to the total weight of air (including the water vapor) is called

absolute humidity
mixing ratio
relative humidity
specific humidity

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

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