Oceans

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

More Questions from Oceans
The St. Lawrence Seaway opened in 1959 allowing oceangoing ships to reach which Minnesota city?
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What is the front of a boat called?
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What does the beluga whales name mean in Russian?
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As much as 80% of marine debris comes from what source?
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Which fish was thought to be extinct until rediscovered in the 20th century?
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What floating animal is eaten by blue whales?
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What percentage of Earth's volcanic activity occurs on the ocean floor?
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A whale's "forelimbs" are known as what?
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