Give the different varieties of coal. Which do you think is the best variety? Why?
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The different varieties of coal are:
The best variety of coal is Anthracite because it contains 80% carbon and thus provide more energy on burning.
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Why is coal often referred to as 'black gold'?
Write in brief about the origin of coal.
Name the main coal-bearing areas of India.
List the state-wise distribution of coal.