How metamorphosed is gneiss?

Asked by Emmeline Harper

Gneiss is a metamorphic rock formed by changing schist, granite, or volcanic rocks through intense heat and pressure. Gneiss is foliated, which means that it has layers of lighter and darker minerals. These layers are of different densities and come about as a result of the intense pressure used to form gneiss.

Michaela Harris, BA Contributor
Michaela Harris
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