Oceans

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

More Questions from Oceans
What does the Atlantic bluefin tuna eat at a young age?
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What ocean is off the east coast of the United States?
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The Titanic was how many feet from keel to bridge?
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The Bering Strait is named for what Danish-born explorer?
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A finless porpoise takes its name from a near-complete lack of which fin?
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What fraction of the Earth do oceans cover?
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What is the area in the ocean that can never be touched by sunlight called?
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What percentage of the ocean's volume is in coastal zones?
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