Oceans

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

More Questions from Oceans
The giant triton is a marine snail that can reach what size?
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Which US State borders two different oceans?
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What do you call the area of land that lies next to an ocean?
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A whale's "forelimbs" are known as what?
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How many collapsible lifeboats did the Titanic carry?
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The Coral Triangle mainly in Indonesia is also referred to as what?
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Which of these oceans is the deepest?
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Approximately how much does the sperm whale's brain weigh?
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