Oceans

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

More Questions from Oceans
Unlike most rivers, which direction do rivers in China generally flow?
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What floating animal is eaten by blue whales?
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How many of the chimneys on the Titanic were used for the boilers?
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Which family of fish do largemouth bass belong to?
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What is the lifespan of the harbor porpoise?
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Which term refers to the regular abnormal warming of the Pacific Ocean?
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What animal is a meat-eating, freshwater fish?
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What fish is named for its long, sharp, toothless jaw?
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