Question

explain quality of coal with their percentage and their formation. don't spam​

Answer 1

Answer:

Quality

The four ranks are: 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. Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite

Percentage

peat. less than 60%

lignite 30-35%

bituminous -70-90%

anthracite-80%

Answer 2

Coal is black or brownish-black, and has a composition that (including inherent moisture) consists of more than 50 percent by weight and more than 70 percent by volume of carbonaceous material. It is formed from plant remains that have been compacted, hardened, chemically altered, and metamorphosed by heat...

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