Question

Name the different varieties of coal found in nature.

Answer 1

Coal: The different varieties of coal are formed inside the Earth depending upon the time it is stored inside the Earth, pressure, and temperature inside the Earth.

The varieties of coal are as follows,

1. Peat
2. Lignite
3. Bituminous
4. Anthracite

The carbon percentage and color of all the varieties of coal are different; therefore, the calorific value of all the types also varies depending upon the carbon percentage.