Question

How is coal formed? What are different types of coal?
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Answer 1

Answer:

types of coal:

Anthracite: The highest rank of coal. ...

Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. ...

Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.

Explanation:

COAL FORMATION

Mining in the Region Mining Techniques & Equipment Coal Formation Terms & Explanations Educational Resources

Coal Formation

COAL FORMATION

The majority of fossils recovered in Cape Breton can be traced to coal areas or coal fields. Fossils have been found ranging from whole or partial tree trunks and branches to shrubs and vine growth. Evolution dates back to pre-historic times – to approximately 325 million years ago when the region was covered in lush, dense vegetation.

Coal beds consist of altered plant remains. When forested swamps died, they sank below the water and began the process of coal formation. However, more than a heavy growth of vegetation is needed for the formation of coal. The debris must be buried, compressed and protected from erosion. Even though all the biological, geographic and climatic factors may be favourable, coal could not be formed unless the plant debris was submerged and buried by sediments.

There are four stages in coal formation: peat, lignite, bituminous and anthracite. The stage depends upon the conditions to which the plant remains are subjected after they were buried – the greater the pressure and heat, the higher the rank of coal. Higher-ranking coal is denser and contains less moisture and gases and has a higher heat value than lower-ranking coal.

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Answer 2

Answer:

• Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
• It is the most abundantly available fossil fuel in India
• There are four types coal-
• Anthracite
• Bituminous
• Lignite
• Peat

Explanation-

• Anthracite - contains 80% carbon, hard, black and compact, found only in Jammu and Kashmir. It is the highest quality of hard coal.
• Bituminous - 60 - 80% carbon, widely used meteorological coal.
• Lignite - 60% of carbon, low grade. It is called brown coal.
• Peat - 35% carbon and burns like wood

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