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USGS CMG InfoBank: Metamorphic Grades

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Comment: 17:55 - 18:32 (00:37)
Source: Annenberg/CPB Resources - Earth Revealed - 18. Metamorphic Rocks
Keywords: "James Sadd", metamorphism, "metamorphic grade", temperature, pressure, prediction, crystalline, texture, geologist, protolith

Our transcription: Metamorphism is a process of progressive change.
As rocks are exposed to higher and higher temperatures and pressures, they're altered in a predictable manner.
As the intensity of metamorphism increases, the rocks become harder and more coarsely crystalline and develop special metamorphic texture.
Geologists refer to progressive metamorphism as an increase in metamorphic grade from low to high.
And the best way to see this pattern of change is to begin with an un-metamorphosed protolith and watch it change as the intensity of metamorphism increases.

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