Oceans

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

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What is the average length in feet of a the adult gray whale?
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What is the famous coral reef just off the coast of Australia called?
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What ocean did the Pilgrims sail across to reach North America?
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What scaleless, snakelike saltwater fish can reach sizes of over 170 pounds?
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How many eggs does a grey nurse shark carry when pregnant?
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What ocean lies between Asia and North and South America?
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In what year was Project Mohole proposed?
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When was the Titanic officially launched?
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