Oceans

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

More Questions from Oceans
What fish's name means "strong-strong" in Hawaiian?
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Which of these states is closest to the Pacific Ocean?
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In what year did the Ocean Drilling Program begin?
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Corals are ancient animals related to what?
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Ocean water cycle means what as it relates to the environment?
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What does the Atlantic bluefin tuna eat at a young age?
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The average life expectancy of a sperm whale is approximately how many years?
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The loss of symbiotic zooxanthellae results in what process?
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