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coal

http://resource.geosciml.org/classifier/cgi/commodity-code/coal

definition Coal is a combustible black or brownish-black sedimentary rock composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen, derived from fossilized organic remains. Coal is subdivided in terms of rank. The hardest form or highest rank is anthracite coal, which can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Intermediate rank coal is bituminous and low rank coal includes lignite. more like this
narrower
http://resource.geosciml.org/classifier/cgi/commodity-code/anthracite original
broader coal original
http://resource.geosciml.org/classifier/cgi/commodity-code/black-coal original
broader coal original
http://resource.geosciml.org/classifier/cgi/commodity-code/brown-coal original
broader coal original
notation
01.01.05.01.01 more like this
Coal more like this
source http://en.wikipedia.org/wiki/Coal more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/commodity-code/carbonaceous-material original
narrower coal original
in scheme commodity-code original
is primary topic of coal