World Geography
The thickness of biosphere is

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

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

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

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World Geography
The texture of a soil refers to

None of these
the distribution of mineral particles in the soil
the crystal distribution in soil
the size distribution of the mineral particles composing the soil

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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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