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Experts Are Particularly Concerned About the U

Question 72

Multiple Choice

Experts are particularly concerned about the U.S.depletion and lack of national reserves of manganese,cobalt,chromium,and platinum because they are nonrenewable ____ resources.​


A) ​security metal
B) ​strategic metal
C) ​biogenic metal
D) ​rare metal
E) ​trace metal

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