What is coal? Describe the four major coal forms
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Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure.
The four types of coal include peat, lignite, bituminous, and anthracite, with anthracite being most desirable due to its high heat content. Coal was formedmillions of years ago during the Carboniferous Period from ancient plants found in swamps and bogs.
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a coal is a fossil fuel made-up of geographical depression under the earth surface. the four major coals are: -
1) Peat- lowest grade coal
2) Lignite- high moisture content
3) Bituminous- used as industrial works and for metallurgical works.
4) Anthracite- highest grade coal
1) Peat- lowest grade coal
2) Lignite- high moisture content
3) Bituminous- used as industrial works and for metallurgical works.
4) Anthracite- highest grade coal
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