Oceans

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

More Questions from Oceans
Brine pools in the ocean have an unusally large concentration of what?
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What two natural predators are known to prey on beluga whales other than humans hunting them?
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Which of these states is closest to the Pacific Ocean?
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What ocean borders China on the east?
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What fish lives in and around the sea anemone?
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Pufferfish and boxfish are deadly to humans because of the presence of what poison in their skin and organs?
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At what two cities did Titanic stop before heading to New York?
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What is the English definition of the scientific whale feeding term "benthic"?
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