This document provides an overview of speleology or the study of caves. It discusses different types of caves including solutional caves, epigenic vs hypogenic caves, and cave levels. Notable features of caves mentioned include depositional forms like stalactites, stalagmites, and flowstone, as well as erosional forms. The document also discusses non-carbonate caves, lava tubes, littoral caves, and notable caves in Minnesota. It concludes by inviting questions and providing a website for more information.