Glacier-carved mountain top (1), Mountain, fault-block (1), Mudstone showing weathering, and Crater, Sunset (2). Paul Fuqua (2003). Retrieved March 14, 2008, from unitedstreaming: http://streaming.discoveryeducation.com/

An earthquake-ruptured SF sidewalk, 1906. and Tectonic plates of the earth IRC (2005). Retrieved March 14, 2008, from unitedstreaming: http://streaming.discoveryeducation.com/