Oceans

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

More Questions from Oceans
Who became the first European to see the Pacific Ocean in 1513 by crossing the Isthmus of Panama?
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Blue whales have an extremely loud call, approximately how loud measured in decibels?
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What percent of the ocean is salt?
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How many of the chimneys on the Titanic were used for the boilers?
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What is one of the nicknames for the long-finned pilot whale?
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What are the average size dimensions of a sperm whale's flippers?
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A large number of islands referred to collectively is a what?
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Approximately what percentage of the average jellyfish's body is water?
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