World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1891 to 1921
1951 to 1981
1921 to 1951
1981 to Present

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World Geography
The temperature inversion is

All of these
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
when the decrease in temperature or moisture or both takes place
whenever the normal decrease of atmospheric temperature

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