This interactive feature introduces viewers to the various types of caves, and describes Karst activity, the process by which naturally-occurring acidic solutions form cavities in soluble rocks. Other topics include...

This case study was designed for use by groups in an introductory geology class. Students will look at the relationship between sinkhole development in a karst terrain and groundwater levels. The lesson could be used in...

This is a companion website to a NOVA television series investigating strange life-forms found in toxic caverns. The program reviews the traditional theory of cave formation; introduces new theories of microbial...

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...