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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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References
King, Hobart
2014 Marble. Geology.com http://geology.com/rocks/marble.shtml, accessed
June 25, 2014.