Gold mining in Alaska WikipediaGold mining in Alaska, a state of the United States, has been a major industry and impetus for exploration and settlement since a few years after the United State

Geology WikipediaGeology (from the Ancient Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science concerned with the solid Earth, the ...Geology

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Manganese WikipediaManganese is a chemical element with symbol Mn and atomic number 25. It is not found as a free element in nature; it is often found in minerals in combination with iron.ZheJi