Oceans

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

More Questions from Oceans
What name refers to trips across the Atlantic Ocean?
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The abyssal zone begins at what depth?
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What is another name for the spinner dolphin?
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What type of sea creature is an Orca?
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The Bermuda Triangle is also known by what name?
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Which of the following sharks do not exist (to the best of human knowledge)?
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What ocean contains the Gulf Stream?
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Which is not a kind of boat or ship?
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