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

echo sounder
seismic surveying
side-scan sonar
All of these

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World Geography
Which among the following statements is/are correct about the symbiotic life of Corals?Algae gives carbon dioxide and other substances the  coral polyp needs.Coral polyp gives off oxygen and other nutrients that the algae needs.Select the correct code from the options given below:

Only 1
Only 2
Both 1 & 2
Neither 1 & 2

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World Geography
Which kind of precipitation occurs when a front or boundary line is formed between two air masses of contrasting temperature?

Convectional
Orographic
Cyclonic
Frontal

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