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Chapter 356 Virtual technology
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Chapter 358 Well-known scientist mysteriously missing
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... ion.
The content of some elements in the earth's crust is only tens of thousands of tons and hundreds of thousands of tons, which is even rarer than gold.
For example, a metal called 铼, the world's proven reserves of only 2,500 tons, but can be used as an industrial catalyst for the manufacture of aircraft engines, rocket engines, the value is very high.
As for rare earth resources, the global exploitable amount is about 50 million tons in 20x8, and the remaining reserves in ...
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