General Knowledge - World Geography - Discussion

77. 

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

[A]. seismic surveying
[B]. echo sounder
[C]. side-scan sonar
[D]. All of the above

Answer: Option D

Explanation:

No answer description available for this question.

Naidu said: (Sep 3, 2013)  
What is meant by seismic surveying can you kindly explain?

Reddy said: (Sep 24, 2014)  
Seismic surveying means noting but the surveying of seismic is known as seismic surveying.

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