Oceans

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

More Questions from Oceans
What is oceanic crust?
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Of all marine crustaceans caught by humans each year, crabs make up what percent?
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What are the chelae on a crab?
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Blue whales have an extremely loud call, approximately how loud measured in decibels?
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What 300+ island Pacific archipelago was formed entirely from volcanoes?
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When the ice of the Arctic Ocean melts it releases nutrients and organisms into the water which promotes the growth of what?
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Who collected the first major statistics for wind and ocean currents?
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Operational oceanography means what as it relates to the environment?
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