Oceans

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

More Questions from Oceans
The Amazon River is connected to which major ocean?
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Which ship was the nearest to the Titanic when the ship sank?
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Which of the oceans is the smallest?
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What percent of the ocean is salt?
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Which is a long, skinny fish with a large snout and a head shaped like a triangle?
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What are the hard plates on the back of members of the Loricariidae family also known as "Armored Catfish Family"?
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The Chinese white dolphin can be what color?
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Brine pools in the ocean have an unusally large concentration of what?
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