Tuff

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.

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Notion

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Science and technology

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What Wikipedia says

Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash lithifies into solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25–75% ash is described as tuffaceous (for example, tuffaceous sandstone).

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

Image: Wilson44691, Public domain, via Wikimedia Commons.