Write the process of formation of coals. Give 2 uses of coal.
Name different forms of coal. Write one property of each.
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The process of formation of coals . 2 use of coal-
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. ... Some iron and steel making and other industrial processes burn coal. The extraction and use of coal causes many premature deaths and much illness.
Forms of coal :
There are four major types (or “ranks”) of coal. Rank refers to steps in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon rich, and harder material. The four ranks are:
1. Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
2. Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. Bituminous usually has a high heating (Btu) value and is the most common type of coal used in electricity generation in the United States. Bituminous coal appears shiny and smooth when you first see it, but look closer and you may see it has layers.
3. Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.
Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.
4. Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon.
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