The lessons in this repository are suitable for teaching students in the Ozarks about karst topography – caves, springs, sinkholes and losing streams – and other related science concepts, such as watersheds, geology, and water pollution. All lessons are in Acrobat PDFs and are available for your use. Some of the pdfs include “hot links” to online resources. You may download the pdfs, for free, as printed or as digital documents, if used or distributed for non-commercial educational purposes. Below is a list of available lessons.