World Geography
The ionosphere contains ionized air that protects the earth from

the ultraviolet rays of the sun
None of these
the falling meteorites
the infrared rays of the sun

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

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

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