Рет қаралды 490
This video was created for Penn State's Geosc 10: Geology of the National Parks (www.e-education.psu.edu/geosc..., by Dr. Richard Alley, College of Earth and Mineral Sciences, Department of Geosciences (www.geosc.psu.edu/) with the assistance of the John A. Dutton Institute for Teaching and Learning Excellence.