冷知识

in gold •  6 years ago  (edited)

海水总含金量=13.35亿吨；按现价每吨3.9千万美元计，总值大约5.2亿亿美元
地壳总含金量=1220亿吨；总值大约475.8亿亿美元

gold seawater
6 years ago by

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