marble

Encyclopedia Article

Article

Marble is a metamorphic rock that forms when limestone is subjected to heat and pressure underground, for example during the regional shifting of the Earth's crust or during volcanic activity.

Photo Credit: 

 
"Marble, South Canyon, Mile 31.8, Colorado River, Grand Canyon, circa 1974," photograph by Margaret Eiseman. Margaret Eiseman Collection (48912). Cline Library, Northern Arizona University.

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