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

side-scan sonar
echo sounder
seismic surveying
All of these

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World Geography
The temperature inversion is

All of these
whenever the normal decrease of atmospheric temperature or moisture or both change with height over
when the decrease in temperature or moisture or both takes place
whenever the normal decrease of atmospheric temperature

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World Geography
The three recognized major fishing grounds of the world are located in the

one in the southern hemisphere only and two in the northern hemisphere
two in the southern hemisphere only and one in the northern hemisphere
northern hemisphere only
southern hemisphere only

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