Oceans

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

More Questions from Oceans
What is the largest island in the Indian Ocean?
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What determines the sex of a sea turtle?
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What is the land area that is closest to the ocean generally called?
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What is a large body of salt water, usually connected to an ocean?
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What is the minimum threshold for the depth of a deepwater operation?
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Which of the following is the smallest of the baleen whale species?
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Plankton largely reside in what part of the ocean?
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Mauritania borders which ocean?
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