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
biosphere
mesosphere
stratosphere

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World Geography
What is the opportunities provided by a country’s demographics in which the working population is much more than the dependent population called?

Demographic Dividend
Real population Density
Demographic Gap
Age structure composition

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World Geography
The main objective of multi-purpose river projects are

flood controls and making rivers navigable
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
All of these
power generation by constructing hydro power stations

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