Oceans

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

More Questions from Oceans
Oceanic means what as it relates to the environment?
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How many of the chimneys on the Titanic were used for the boilers?
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In the 1970's, a large and failed expansion to Florida's Osborne Reef was comprised mostly of what?
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The Irrawaddy dolphin is similar to which whale in appearance?
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Who was the United States President during the Titanic disaster?
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The world record ice-fishing catch of a trout in 1987 was?
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What does ocean ranching mean?
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What fraction of the Earth do oceans cover?
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