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What is one of oceanography's tools Munk helped develop?

Ocean acoustic tomography
Underwater drones
Deep-sea rovers
Satellite imagery

Answer

Ocean acoustic tomography, a tool developed by Walter Munk, uses sound waves to map the temperature and current of the ocean. Sound waves are transmitted from a source and received by a receiver, and the time it takes for the sound to travel between the two can provide valuable information about the medium it passes through.