Coal is the most abundantly available fossil fuel.
Importance of its different forms:
1. Peat: It comes from decaying plants in the swamp. It has low heating capacity because of low carbon and high moisture content.
2. Lignite: It’s a soft low-grade brown coal with high moisture content. Its principal reserve is in Neyveli, Tamil Nadu.
3. Bituminous: It is buried deep and subjected to high temperatures. High-grade bituminous is the metallurgical coal used especially in smelting iron.
4. Anthracite: It is the highest quality hard coal.
Explanation: Coal occurs in different forms and each has different uses and capacity depending on the degree of the compression of plant material.
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