Oceans

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

More Questions from Oceans
Coral reefs are largely in what ocean zone?
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Which of the following is not a nickname for the beluga whale?
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What percentage of the ocean's volume is in coastal zones?
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Who built the ship RMS Titanic?
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How many oceans does the equator pass through?
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Ocean water cycle means what as it relates to the environment?
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The Mariana Trench in the Pacific Ocean is the deepest known area of Earth’s oceans at around how many meters?
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The Apo Reef is located where?
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