World Geography
The thickness of biosphere is

5-8 km above the earth's surface
5-10 km above the earth's surface
10-12 km above the earth's surface
8-10 km above the earth's surface

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World Geography
The modern theory of plate tectonics states

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

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