World Geography
The metamorphism which involves the chemical replacement of elements in rock minerals when gases and liquids permute into bedrock is called

thermal metamorphism
dynamic metamorphism
contact metamorphism
metasomatic metamorphism

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

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

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