The Physical Environment

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Outcrop of the Ogallala Formation (sandstone), the main water-bearing unit of the High Plains aquifer, near the Canadian River in Texas.
Courtesy USGS.

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For Citation: Ritter, Michael E. The Physical Environment: an Introduction to Physical Geography.
Date visited.  https://www.earthonlinemedia.com/ebooks/tpe_3e/title_page.html

©2003 - 2016 Michael Ritter (tpeauthor@mac.com)
Last revised 6/5/12