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USGS CMG InfoBank: The Rock Cycle

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Comment: 11:12 - 11:57 (00:45)
Source: Annenberg/CPB Resources - Earth Revealed - 7. Mountain Building
Keywords: sediment, continent, magma, mantle, subduction, "sea floor", volcanism, "sedimentary rock", "metamorphic rock", "igneous rock", "rock cycle", crust, erosion, orogeny

Our transcription: These hardened rock types slowly wear away contributing new sediment to the sea.
Much of the rock does not wear away, however; instead, it remains attached, adding new mass to the continent.
New material is also added as magma from the underlying mantle and subducting ocean floor rise up into the crust to cool and harden or to erupt as lava and ash.
The continuous transformation of material from sedimentary, to metamorphic, to igneous and back again, is called the rock cycle.
Throughout a growing mountain range, the complete rock cycle may be active creating new continental crust.

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