What is the definition of "sound" that has to do with the ocean?

Question

This will be on my science quiz tuseday but I haven't found the definition yet, ten points to the best answer.

Answer 1

waves

Answer 2

sonar? Sound travels through water, the rate of speed of sound is slowed due to the medium.

You can map the ocean floor using sonics/sonar. You can find out where fish are and other aquatic life using sonar.

Some sea creatures use sonics in communication, such as the whale.

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I would say acoustic vibration and how it can travel efficiently, would have to do with the ocean.