World Geography
The main percentage of the volume of water in the hydrosphere is in

oceans and seas
groundwaters, rivers and streams
glaciers and ice sheets
freshwater lakes and water vapours

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

plants of a particular region or period, listed by species and considered as a group
a large tract covered by trees and shrubs and its administration for assessing economic benefits
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

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