Coal contains mainly carbon. Coal is the major resource for all industries and is in great demand. Especially for the Indian railways
Formation of coal
Dense forests got buried under the soil due to natural processes, millions of years ago. More and more soil got deposited over them and they got compressed more. This led them to get exposed to very high temperature and pressure. They slowly got converted into coal under these extreme conditions. The whole process of the formation of coal from dead vegetation is known as carbonization.
Best type of coal
Anthracite is regarded as the highest and best quality of coal. It comprises of more than 87% of carbon. It is hard and glossy in nature. It has the highest heating value. It is mainly used for residential and commercial purposes.