Oceans

What did early ocean scientists use to measure the distance to the ocean floor?

More Questions from Oceans
Which family of fish do largemouth bass belong to?
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What produces ocean tides?
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A finless porpoise takes its name from a near-complete lack of which fin?
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What is one of the nicknames for the long-finned pilot whale?
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Which of the following is a unique characteristic of minke whales?
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Where does the female marine catfish lay her eggs?
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Overfishing means what as it relates to the environment?
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OPDS stands for what?
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