EARTH 104 Module 5 How Do We Know?
Channel: Dutton Institute
Date: 19/11/2014

This video was created for Penn State's EARTH 104 course (https://www.e-education.psu.edu/earth104) with the assistance of Dr. Richard B. Alley and the John A. Dutton e-Education Institute (https://www.e-education.psu.edu/)