World Geography
The metamorphism which involves the chemical replacement of elements in rock minerals when gases and liquids permute into bedrock is called

dynamic metamorphism
contact metamorphism
metasomatic metamorphism
thermal metamorphism

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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 shock wave, associated with the gusty solar wind, compresses the magnetosphere
when the gust wind itself engulfs the magnetosphere
None of these

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