Images are from www.google.com/images

Information about the desert is from http://environment.nationalgeographic.com/environment/habitats/desert-profile/

Map of the southwestern United States is from http://www.americansouthwest.net/map.html

PACE Model outline is from Donato and Adair-Hauck, 1994

Sound recorded in Audacity by Kaitlyn Stooks

Text is from Crummel, S. S. Tumbleweed stew. New York, NY: Harcourt, Inc.