World Geography
The modern theory of plate tectonics states

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

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World Geography
The initial increase of magnetic field in magnetic storms is caused

when there is a large decrease in field intensity
when the gust wind itself engulfs the magnetosphere
when the shock wave, associated with the gusty solar wind, compresses the magnetosphere
None of these

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