World Geography
The ozone layer at high altitude contains

only ozone (O3)
only ordinary oxygen (O2)
atomic oxygen (O) and ordinary oxygen (O2)
mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3)

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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
Only 1
Neither 1 & 2
Only 2

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