Oceans

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

More Questions from Oceans
A whale's "forelimbs" are known as what?
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The loss of symbiotic zooxanthellae results in what process?
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The group of crustaceans that include crabs, lobsters and shrimps have how many legs?
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What do Baleen whales lack that other whales have?
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Which reef would you find in the Gulf of Mexico?
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Coral reefs are largely in what ocean zone?
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The Amazon River empties in to which of these oceans?
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About how many million tons of salt are obtained from the ocean each year?
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