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

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

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World Geography
The term 'flora' in the context of natural vegetation refers to

assemblage of plant species living in association with each other in a given environmental frame
a large tract covered by trees and shrubs and its administration for assessing economic benefits
plants of a particular region or period, listed by species and considered as a group
role played by species of animals in the maintenance of ecological balance

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World Geography
In which rocks does most of the formation of caves take place?

Sandstone
Quartzite
Granite
Limestone

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