Oceans

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

More Questions from Oceans
Which family of fish do largemouth bass belong to?
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The St. Lawrence Seaway opened in 1959 allowing oceangoing ships to reach which Minnesota city?
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What fish lives in and around the sea anemone?
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Which of these states is closest to the Pacific Ocean?
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What type of algae live symbiotically with coral reefs in shallow waters?
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The Great Barrier Reef lies just off what continent?
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What is a colorful fish that lives among sea anemone?
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What time and day did the Titanic collide with the iceberg?
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