Advantages and Disadvantages of Coal Advantages
17/01/2020#0183;#32;Know More Advantages and Disadvantages of Breastfeeding. HOW IS COAL OBTAINED? Underground formations called seams or beds are places where it is found. A coal bed can be as long as 1500 kilometres, and nearly 90 feet thick. It is extracted by mining, which can be surface or underground. Surface mining works for seams that are less than 200 feet underground.