Continental Crust 3 : The type of crustal rocks underlying the continents and continental shelves; having a thickness of 25-60 km (16-37 mi) and a density of approximately 2.7 grams per cubic centimeter
National Park Service, U.S. Department of the Interior, Geologic Resources Division, Natural Resource Program Center, Wolf Trap National Park for the Performing Arts, Geologic Resource Evaluation Report, Natural Resource Report NPS/NRPC/GRD/NRR 2008/041, Technical Geologic Terms, Denver, Colorado, USA 2008. http://www.nature.nps.gov/geology/inventory/public ations/reports/wotr_gre_rpt_view.pdf, (ND/ Lndsld - Amer) {923}