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Name: Kathryn
Status: Educator
Age: 50s
Location: N/A
Country: N/A
Date: November 27, 2004


Question:
What is with the rock cycle? Visiting geologists have insisted that igneous rocks never turn into metamorphic rocks, but that is contrary to everything I have been able to research...Granite 0 gneiss,etc.



Replies:
I have no idea what rock cycle they are looking at, but granitic rocks subjected to regional metamorphism during mountain building become metamorphic gneiss. Any rock (igneous, metamorphic or sedimentary) subjected to sufficient heat and/or pressure can be metamorphosed. I am not familiar with what they may be basing their conclusions on, but if you are a teacher, please feel comfortable teaching as you have been---it sounds like you are conscientious, thoughtful teacher. Thanks for your hard work.

Pat Rowe



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