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Igneous Rocks. (n.d.). In Views of the National Parks. Retrieved March 30, 2015, from http://www.nature.nps.gov/views/Sites/DETO/HTML/ET_Igneous.htm Sedimentary Rocks. (n.d.). In Views of the National Parks. Retrieved March 30, 2015, from http://www.nature.nps.gov/views/Sites/DETO/HTML/ET_Sedimentary.htm Metamorphic Rock. (n.d.). In Museums Teaching Planet Earth. Retrieved from http://www.geog.ucsb.edu/~dylan/mtpe/geosphere/topics/rx/metamorphic.html McDougal, H. (2012). Science Fusion The Dynamic Earth (pp. 174-179). Orlando, FL: Houghton Mifflin Harcourt Publishing.
