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USGS CMG InfoBank: Igneous and Metamorphic Rocks

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Comment: 10:36 - 11:12 (00:36)
Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building
Keywords: mountain, "metamorphic rock", "igneous rock", orogeny, sediment, fold, melting, "granitic rock", magma, mantle, basalt, crust, "Jason Saleeby"

Our transcription: In the course of mountain ranges, we could see in the metamorphic rocks that sediments are folded, and metamorphosed, and actually involved and melted into typically granitic types of materials.
We also look within the igneous and metamorphic core and see evidence of magma that move directly out of the mantle, which will be more basaltic composition, and, in many instances, promoted the melting of the crustal rocks.
We also see evidence of older continental crust having been heated up, and melted, and rejuvenated into younger new continental crust.

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