Oceans

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

More Questions from Oceans
A large collection of islands in the ocean is called what of these?
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How many oceans does the equator pass through?
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Which of the following has the largest head of any animal?
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As much as 80% of marine debris comes from what source?
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A large number of islands referred to collectively is a what?
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Which ship was the nearest to the Titanic when the ship sank?
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In what ocean would you most likely find glaciers floating?
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Which term refers to the regular abnormal warming of the Pacific Ocean?
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