Oceans

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

More Questions from Oceans
The longest river in the world is located on what continent?
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Approximately how many pounds does the average sperm whale's heart weigh?
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What is the up and down movement of ocean water caused by wind called?
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Which of these is considered the world's smallest fish?
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What type of algae live symbiotically with coral reefs in shallow waters?
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Which of these oceanic zones allows photosynthesis?
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Approximately how long is the gestation period for a blue whale calf?
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Which of the following is the smallest of the baleen whale species?
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