Plural of breccia; multiple types or instances of rock composed of angular fragments cemented together.
Plural form of breccia, from Italian breccia meaning broken stone, which entered English geological terminology in the 18th century.
Museums often display beautiful breccias because they look like colorful puzzles—you can see all the different rock types that got smashed and cemented together, sometimes from ancient earthquakes or landslides millions of years ago.
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