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Karst.

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View Resource Karst

Karst is defined as a terrain with distinctive landforms and drainage arising from greater rock solubility in natural water that is found elsewhere. This definition is part of the first site regarding this topic entitled Karst (1), which is provided by Purdue University instructor Robert Hall. The PowerPoint presentation provides a general introduction to the subject, tells how karst landforms...

https://scout.wisc.edu/report/nsdl/ps/2003/0516
View Resource Underground Rivers

Professor Emeritus Richard J. Heggen of the University of New Mexico has a deep and abiding interest in underground rivers. As a professor civil engineering, he has performed many intricate studies of such systems, and from a diverse set of perspectives which include the humanities, natural history, philosophy, and of course, geology. In the introduction to this fascinating book, Heggen notes that...

http://www.unm.edu/~rheggen/UndergroundRivers.html