World Geography
The main period of Mesozoic era include

Triassic period and Cretaceous period
Triassic period, Jurassic period and cretaceous period
Jurassic period and Triassic period
cretaceous period and Jurassic period

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

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

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World Geography
The temperature inversion is

All of these
whenever the normal decrease of atmospheric temperature
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

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