Advances in Coal Science and Technology

Coal is a black combustible sedimentary rock. It is formed when plants decay into peat. It transforms into coal due to pressure and heat of the deep burial over millions of years. It is a primary energy source which is used to generate a significant share of world's electricity. It is also used in other industries such as iron and steel. The extraction of coal from ground is known as coal mining. Some of the techniques used for extraction of coal are contour mining, surface mining, undergro...