I need to write a 500- to 750-word explanation regarding the role of plate tectonics in the origin of metamorphic rocks. Can someone help me get started with this and on the right track? Thanks
http://www.tulane.edu/~sanelson/eens211/metamorphic_facies.htm
http://www.cliffsnotes.com/study_guide/Metamorphism-and-Plate-Tectonics.topicArticleId-9605,articleId-9489.html