Oceans

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

More Questions from Oceans
Which of these creatures would inhabit the bathyal zone?
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Which of these contains the deepest point in the Pacific ocean?
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Which of these is the largest of the world's oceans?
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Which ocean's water is the coldest?
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The beluga whale is what color as an adult?
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Which reef would you find in the Gulf of Mexico?
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Which of the following characterizes the environment in which sperm whales live?
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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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