Skip to main content
An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Concept information

Preferred term

coal

Type

  • Product

Definition

  • Information 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.

Narrower concepts

In other languages

URI

https://lod.nal.usda.gov/nalt/27354

Download this concept:

RDF/XML TURTLE JSON-LD Created 1/19/06, last modified 10/7/20