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《《 Water-pollution problems caused by mining include acid mine drainage, metal contamination, and increased sediment levels in streams. Sources can include active or abandoned surface and underground mines, processing plants, waste-disposal areas, haulage roads, or tailings ponds. it also cause soil pollution 》》
Actually ph of solution is inversely proportional to hydrogen ion....more the ph lesser the hydrogen ions more the ph more the oh ion present.... ph range 0-6.9-acidic colour red pink orange ph 7 neutal no color ph 7.1-14 basic colour blue violet