World Geography
The oldest rock system of the world is:

The Archaean Rock system
The Primitive Rock system
The Zircons Rock system
None of these

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World Geography
What is the weight of actual amount of water vapour present in unit volume of air called?

Relative Humidity
Absolute Humidity
Condensation
Specific Humidity

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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 1
Both 1 & 2
Neither 1 & 2
Only 2

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