Oceans

What instrument uses sound waves to help get a picture of the ocean's bottom?

More Questions from Oceans
A finless porpoise takes its name from a near-complete lack of which fin?
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What instrument uses sound waves to help get a picture of the ocean's bottom?
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What does a human have to wear when exploring the depths of the ocean?
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How many collapsible lifeboats did the Titanic carry?
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Who really owned the Titanic?
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Any material deposited by a river is called what?
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What is a colorful fish that lives among sea anemone?
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Which species of shark was the first to be protected by being put on the Threatened Species List?
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