Oceans

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

More Questions from Oceans
Which is not a kind of boat or ship?
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Which of the following classifications of mammal do whales belong to?
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The definition of "the periodic rising and falling of the earth's oceans and atmosphere" best fits which science term?
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What is the up and down movement of ocean water caused by wind called?
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Which of the following seafood fish is usually pink/orange in color?
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What is a scientist who studies life in the ocean called?
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The ocean tide is created by earths relationship to which of these celestial bodies?
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Blue whales have an extremely loud call, approximately how loud measured in decibels?
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