Formation of coal
Текст на Статията
- Two friends stumble across a mysterious black hard substance...
- What is this? How is it formed?
- This is a piece of coal. Let us see how it is formed...
- The dead remains of plants sink underground...
- There are four types of coal based on the amount of heat and pressure they are subjected to...
- 1) Peat:
- Lignite:
- And Anthracite:
- What we have found here seems to be a piece of anthracite. It has very high calorific value, which means it gives out more heat upon burning. It makes a good fuel.
- Wow! That is so interesting!
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