Oceans

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

More Questions from Oceans
Which state, although widely known for seafood, only has eight miles of Atlantic Ocean coastline?
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What is the deepest ocean zone?
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Which ocean shrinks by one inch every year?
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About how many million tons of salt are obtained from the ocean each year?
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The 'Bering Strait' is a piece of the Pacific ocean that divides which of these two countries?
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What is a high place from which rivers flow in all directions?
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The Atlantic Ocean separates Brazil from which continent?
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What happens to a goldfish when its kept in the dark?
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