Oceans

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

More Questions from Oceans
The Atlantic Ocean separates Brazil from which continent?
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What part of kelp holds it to the ocean floor beneath it?
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The tidal mouth of a large river best fits what geography term?
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Oceanic trench means what as it relates to the environment?
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What ocean contains the Gulf Stream?
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The blowhole of a sperm whale is shaped like which of the following letters of the alphabet?
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Which of the following sharks do not exist (to the best of human knowledge)?
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The Irrawaddy dolphin is similar to which whale in appearance?
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