Oceans

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

More Questions from Oceans
What are scientists that study the ocean called?
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Which of these creatures would inhabit the bathyal zone?
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What does a Nictitating membrane on a shark do?
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What percentage of Earth's volcanic activity occurs on the ocean floor?
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Which ocean forms the entire western border of Chile?
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A low-oxygen area of the ocean is often referred to as what?
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Which of Colombia's geographical regions begins at the shore of the Pacific Ocean?
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The OSPAR Convention is short for what?
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