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OpenStudy (anonymous):
Sound waves can be used to measure ocean depth. This is done by sending a sound wave to the floor of the ocean and recording the time it takes to return to a machine. What did the inventor of this machine need to know while developing the machine? A. The speed of light waves in water. B. The speed of sound waves in water. C. The speed of water waves. D. The speed of sound waves in air.
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