NCERT Class 8 Science Chapter 5 Notes
WEBAug 23, 2023 · Coal. It is as hard as stone and is black in colour. Since coal was formed from the remains of vegetation, it is also called a fossil fuel. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation. There are four types if Coal Peat, Lignite, Bituminous and Anthracite.