World Geography
The oldest rock system of the world is:

None of these
The Zircons Rock system
The Primitive Rock system
The Archaean Rock system

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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
role played by species of animals in the maintenance of ecological balance
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

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