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sodium carbonate is a common inorganic industrial chemical also known as soda ash na co .it used in the manufacture of glass, chemicals, such as sodium silicates
mountaintop coal mining is a surface mining practice involving removal of mountaintops to expose coal seams, and disposing of associated mining overburden in adjacent
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abutment — in coal mining, the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch
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coal miners use large machines to remove coal from the earth.many u.s.coal deposits, called coal beds or seams, are near the earth's surface, while others are deep
coal is one of the most water intensive methods of generating electricity.a typical coal plant withdraws enough water to fill an olympic sized swimming pool every
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a series of refining steps are required to produce soda ash from trona ore.first the raw ore from the mine is crushed and screened.the materia l is then fed to
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by eileen mountjoy.during the late 's and early 's, the combination of coal, capital, and railways brought a gigantic new industry to jefferson and indiana
a.abutment in coal mining, the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch
sodium carbonate also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate na co is the water soluble sodium
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