Oceans

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

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What animal is a meat-eating, freshwater fish?
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Who built the ship RMS Titanic?
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What keeps the salinity of the ocean the same throughout the year?
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More than 50% of all lakes in the world are in which country?
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Which describes a SRN4?
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Who collected the first major statistics for wind and ocean currents?
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What surface rock comprises the majority of the Earth's crust in the area beneath the oceans?
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Ghost fishing refers to what?
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