Oceans

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

More Questions from Oceans
What does the Chilean basket star eat?
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Which of these oceanic zones allows photosynthesis?
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What is a high place from which rivers flow in all directions?
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Which of Colombia's geographical regions begins at the shore of the Pacific Ocean?
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At what depth may you need to go to see a frilled shark in the ocean?
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What ocean borders China on the east?
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Which fish helps balance the algae and coral on a reef?
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Which ocean is among the traditional "Seven Seas"?
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