World Geography
The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as

ionosphere
mesosphere
stratosphere
biosphere

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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:

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

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