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How Coal forms. A description of its formation as part of a field trip to northern Alaska. ... The pressure from overlying sediments that bury a peat bed will compact the coal. Peats transform to low grade lignites when they are compressed to about 20% of their original thickness.
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www.athro.com/geo/trp/gub/coal.html
www.athro.com/geo/trp/gub/coal.html
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Coal is formed by heat and pressure over millions of years on vegetation deposited in ancient shallow swamps (see peat). It varies in density, porosity, hardness, and reflectivity. The major types are lignite, subbituminous, bituminous, and anthracite.
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www.britannica.com/EBchecked/topic/122863/coal
www.britannica.com/EBchecked/topic/122863/coal
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peat coal ( ′pēt ′kōl ) ( geology ) A coal transitional between peat and lignite. ( materials ) Artificially carbonized peat that is used as a ... How would you describe peat coal?
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www.answers.com/topic/peat-coal
www.answers.com/topic/peat-coal
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Peat is a dark fibrous material created when 'decomposition fails to keep pace with the production of organic matter'. It is the first stage of transformation of plant matter into coal.
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www.uow.edu.au/arts/sts/sbeder/wingecarribee/peatlands/...
www.uow.edu.au/arts/sts/sbeder/wingecarribee/peatlands/what.html
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We use the term "coal" to describe a variety of fossilized plant materials, but no two coals are exactly alike. ... Coal is classified into four general categories, or "ranks." They range from lignite through subbituminous and bituminous to anthracite, reflecting the progressive response of individual deposits of coal...
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www.ket.org/Trips/Coal/AGSMM/agsmmtypes.html
www.ket.org/Trips/Coal/AGSMM/agsmmtypes.html
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E. SPECIAL CASES; Initial Reviews of SSSI Sites ; SSSI Sites of International Importance ; Peat ; Coal ; F. PERIODIC REVIEWS; Key Points ; Duty to Review and Definition of Mining Site ; Aggregate of Two or More Permissions ;
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www.scotland.gov.uk/Publications/1996/11/circular-34-19...
www.scotland.gov.uk/Publications/1996/11/circular-34-1996-root
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Peat and Coal Peat ... Peat and Coal Peat is a partially decomposed and compressed accumulation of dead, terrestrial plants and coal is just the chemically matured and compacted form of peat. Four requirements for coal formation (of which the first two are required for peat formation):
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www.st-andrews.ac.uk/~crb/web/earth_resources2.htm
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Chemical analyses of morphologically preserved organic matter in a Carboniferous coal ball reveal that the material is coalified to a rank approximately equal to that of the surrounding coal. Hence, the plant tissues in the coal ball were chemically altered by coalification processes and were not preserved as peat.
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www.sciencemag.org/cgi/content/short/217/4562/831
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any carbon-containing fuel derived from the decomposed remains of prehistoric plants and animals, e.g. coal, peat, petroleum, and natural gas...
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encarta.msn.com/dictionary_1861690690/fossil_fuel.html
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