World Geography
The knowledge about the topography of the ocean basins has been derived from

seismic surveying
echo sounder
All of these
side-scan sonar

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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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