Oceans

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

More Questions from Oceans
In which ocean is Hawaii located?
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What is the land area that is closest to the ocean generally called?
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What nutrient found in fish is thought to be good for both your heart and your brain?
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As much as 80% of marine debris comes from what source?
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What kind of tail does a shark have?
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What does a shark's liver contain a lot of?
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The three types of ice that cover the Arctic Ocean are polar ice, fast ice and what?
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The giant triton is a marine snail that can reach what size?
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