Słuchacze pytają, my odpowiadamy. A właściwie dr Rożek odpowiada. Dzisiaj bierzemy na warsztat pytanie od Pana Jerzego: skoro metale ziem rzadkich, wcale nie są rzadkie. To jakie metale są rzeczywiście rzadkie? A które metale są najbardziej obfite? Jerzyk l.52
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