Oceans

What valuable metal is found in the oceans but is expensive to extract?

More Questions from Oceans
Which term refers to the regular abnormal warming of the Pacific Ocean?
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What do bridge workers use to prevent rust from forming on bridges near the ocean?
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On a reef, an individual coral is known as a what?
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What animal is a meat-eating, freshwater fish?
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What does a shark's liver contain a lot of?
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All of Brazil's river systems drain into which ocean?
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What is the smallest sailboat listed?
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Which of these is the smallest of the world's oceans?
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