Oceans

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

More Questions from Oceans
Into which ocean does the Zambezi River flow?
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Ghost fishing refers to what?
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The Atlantic Ocean was named after who in Greek mythology?
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Humpback whales use which of the following to trap krill, plankton, and or small fish like herring, mackerel, capelin and sand eel?
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Coral reef means what as it relates to the environment?
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Which state, although widely known for seafood, only has eight miles of Atlantic Ocean coastline?
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Of all marine crustaceans caught by humans each year, crabs make up what percent?
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What fish has a venom as powerful and deadly as a rattlesnake's bite?
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