Oceans

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

More Questions from Oceans
What is a scientist who studies life in the ocean called?
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When looking at an ocean, which of these is the color it mostly appears to be?
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Relating to the environment, what does Operational oceanography mean?
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The hadal zone begins at what depth?
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Which animal spawns in fresh water but lives most of its life in the sea?
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What fraction of the Earth do oceans cover?
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Oceanic trench means what as it relates to the environment?
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The Atlantic Ocean was named after who in Greek mythology?
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