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

contact metamorphism
dynamic metamorphism
metasomatic metamorphism
thermal metamorphism

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World Geography
Which among the following statements is/are correct about the Gravity Model of Migration?According to the gravity model, the migration between two places is inversely proportional to the product of the population of the two centres.The gravity model implies that the capacity of an area to attract migrants depends upon the size of its population or its economic potential.Select the correct code from the options given below:

Both 1 & 2
Neither 1 & 2
Only 2
Only 1

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