Oceans

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

More Questions from Oceans
What is the estimated top speed of a Sperm whale?
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French Frigate Shoals reef is located where?
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All of Brazil's river systems drain into which ocean?
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Where would you find lakes called QianHai, BeiHai and HouHai?
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What is a common unit of depth in the ocean?
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The only enemy to the orca or killer whale is which of the following predators?
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A finless porpoise takes its name from a near-complete lack of which fin?
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Which U.S. State is located closest to the Atlantic Ocean?
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