Students examine groundwater and its relationship to springs, artesian wells, ordinary wells, and sinkholes. They describe the process by which sinkholes are formed. They investigate saltwater contamination and its causes.

Article reports on how the appearance of large sinkholes near the Dead Sea are affecting the famous lake. Includes video.

Describes how and why sinkholes form, how to build a house and the effects on plumping in karst terrain, describes collapse sinkholes, and overall effects of sinkholes.