Marble and the metamorphics

That sounds like the name of a Do-Wop band. So since I touched on igneous rocks in general and granite in particular yesterday, today I want to talk about the metamorphics. My diagram above shows sedimentary rocks on a sea floor being subducted under a tectonic plate. That sedimentary rock will turn into metamorphic rock given enough time, enough heat and enough pressure. So what was once sediment on the bottom of the sea turns into metamorphic rock as it gets pushed down into the slow cooker that sits directly below our feet. If it doesn’t run into anything, it will turn into an igneous rock eventually. But then I wouldn’t have anything to write about.

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