Oceans

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

More Questions from Oceans
How many chambers do the hearts of sperm whales have?
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What are scientists that study the ocean called?
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How many different types of coral would you find on the Barrier Reef?
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Which of the oceans is the smallest?
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What does the Atlantic bluefin tuna eat at a young age?
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What is the third largest ocean in the world?
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A group of fish swimming together is called what?
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A common food for a sea turtle would be what?
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