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By using sound waves, signals allow oceanographers to determine ocean depth. a. radar b. phone c. sonar d. radio

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C is the appropriate answer. sonar. Oceanologists use sonar to determine the depth of the ocean. A sonar signal is sent from the ship. Oceanologists record the time it takes for the signal to leave the ship and return it. Knowing the speed of sound in water, they are able to calculate the depth of the water. This method is also used to generate bathymetric images of the ocean floor.