Coal

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Coal is a combustible black or brownish-black sedimentary rock, formed as layers called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Excerpt from the Wikipedia article “Coal”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Amcyrus2012, CC BY 4.0, via Wikimedia Commons.