Oceans

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

More Questions from Oceans
Which describes a SRN4?
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The world's largest artificial reef, the U.S.S. Oriskany, can be found in what ocean?
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The crown-of-thorns starfish has been known to cause harm to what?
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How many oceans does the equator pass through?
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How many eggs does a grey nurse shark carry when pregnant?
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What fraction of the Earth do oceans cover?
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What is a group of seals commonly know as?
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Which of these is a type of natural coral reef?
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