Coal Mining The goal of coal mining is to economically remove coal from the ground. Coal is valued for its energy content, and since the 1880s is widely.
Manganese is a chemical element, designated by the symbol Mn. Manganese is a silvery-gray metal resembling iron. It is hard and very brittle,
Prepared by: Johanne Miguel F. Aca -ac Vanessa May A. Enriquez
