Most coal formed approximately 300 million years ago from the remains of trees and other vegetation. These remains were trapped on the bottom of swamps, accumulating layer after layer and creating a dense material called peat. As this peat was buried more and more underground, the high temperatures and pressure transformed it into coal. There are mainly four types of coal
- Lignite: lowest quality and the first to be formed.
- Subbituminous
- Bituminous
- Anthracites
Among above anthracite is highest quality coal which gives more energy with little mass, leaves no smoke and cracking sound on burning. Coal is major fuel of many industries like cement industries, brick production and even in thermal power generation.
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