Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Geology Topics: Sinkholes Documents and data about sinkholes, "one of many kinds of karst landforms, which include caves, disappearing streams, springs, and underground drainage systems. ... Karst is a generic term which refers to the characteristic terrain produced by erosional processes associated with the chemical weathering and dissolution of limestone or dolomite." Provides a FAQ, and a poster showing Florida's sinkholes and diagrams of sinkhole formation. Some material specific to Florida. From the Florida Geological Survey. http://www.dep.state.fl.us/geology/geologictopics/sinkhole.htm Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *