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CrowdScience - Why are there lumps of metal at the bottom of the ocean? - 91热爆 Sounds

From: CrowdScience

Why are there lumps of metal at the bottom of the ocean?Why are there lumps of metal at the bottom of the ocean?

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Andrea Koschinsky tells us how 鈥榩olymetallic nodules鈥� form over millions of years

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Why are there lumps of metal at the bottom of the ocean?
Andrea Koschinsky tells us how 鈥榩olymetallic nodules鈥� form over millions of years
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