Coal: Difference between revisions
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[[File:Coal Transported to the nearby Meremere Power Station, 1966.jpg|thumb|250px|Maramarua Open Cast Coal Mine in New Zealand, 1966]] | [[File:Coal Transported to the nearby Meremere Power Station, 1966.jpg|thumb|250px|Maramarua Open Cast Coal Mine in New Zealand, 1966]] | ||
'''Coal''' is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly [[carbon]] with variable amounts of other elements, chiefly [[hydrogen]], [[sulfur]], [[oxygen]], and [[nitrogen]]. 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. Coal is primarily used as a [[fuel]]. Coal is very soft ranking from 2 to 4 on the | '''Coal''' is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly [[carbon]] with variable amounts of other elements, chiefly [[hydrogen]], [[sulfur]], [[oxygen]], and [[nitrogen]]. 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. Coal is primarily used as a [[fuel]]. Coal is very soft ranking from 2 to 4 on the Mohs hardness scale, while sandstone ranks from 5 to 7. | ||
== Dependencies == | == Dependencies == | ||
Revision as of 04:50, 6 May 2025
- Not to be confused with Charcoal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. 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. Coal is primarily used as a fuel. Coal is very soft ranking from 2 to 4 on the Mohs hardness scale, while sandstone ranks from 5 to 7.
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References
| This article uses material from the Wikipedia article Coal, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). | 
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