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Preferred Term:

coal

Definition:
A readily combustible black or brownish-black rock whose composition, 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 and pressure over geologic time.
Concept Schemes:
https://lod.nal.usda.gov/nalt-core
NALT Full
Narrower Concepts:
URI:
https://lod.nal.usda.gov/nalt/27354
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RDF/XMLCreated 2006-01-19, last modified 2020-10-07