Oceans

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

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Rough fish means what as it relates to the environment?
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Into which ocean do most Chinese rivers empty?
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About how many million tons of salt are obtained from the ocean each year?
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How many eggs does a grey nurse shark carry when pregnant?
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Which of these oceans remains frozen throughout most of the year?
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How long did it take Columbus to cross the Atlantic?
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Which two oceans lie east and west of Argentina?
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What's the name for the scientific study of bodies of fresh water?
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