Answer
The formation of coal typically involves the following successive stages:
1. Peat Formation: It begins with the accumulation of partially decayed plant material, such as mosses and ferns, in wetland areas like marshes and swamps. This organic matter is called peat.
2. Lignite Formation: Over time, with burial and increasing pressure, the peat undergoes physical and chemical changes, transforming into a low-grade coal known as lignite. Lignite is brown in color and has a relatively high moisture content.
3. Bituminous Coal Formation: Further burial and compaction of lignite result in the formation of bituminous coal. It has a higher carbon content compared to lignite, making it a higher-grade coal with improved energy content.
4. Subbituminous and Anthracite Formation: Through additional heat, pressure, and time, bituminous coal can further metamorphose into subbituminous coal, which is even harder and has a higher carbon content. With further metamorphism, anthracite coal, the highest grade of coal with the highest carbon content and energy value, can be formed.
It's important to note that the stages of coal formation can vary in duration and intensity depending on geological conditions.
Work Step by Step
Refer to the above answer.
