Oceans

Which underwater machine helps humans travel around beneath the surface of the ocean?

More Questions from Oceans
About how many million tons of salt are obtained from the ocean each year?
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Of all marine crustaceans caught by humans each year, crabs make up what percent?
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What is eutrophication as it applies to oceans?
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Besides Greenland, what is the largest island in the Atlantic Ocean?
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Which direction do most ocean currents flow at the equator?
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Which U.S. state has "The Ocean State" as its nickname?
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Who is credited as being the discoverer of the Pacific Ocean?
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What fish lives in and around the sea anemone?
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