Slide 10.-Sinkhole at Winter Park Florida-Sinkholes, although not classified as landslides, are another form of ground subsidence that can happen catastrophically. This sinkhole occurred in 1981, in the time span of one day. The city of Winter Park stabilized and sealed the sinkhole, converting it into an urban lake. This form of subsidence occurs when carbonate layers that lie below the surface dissolve. When the weight of the overlying ground becomes too great, or the dissolved area too large, the surface collapses into the void. These features occur in what is known as karst topography which is common in Florida, Kentucky, Missouri, Pennsylvania, and Tennessee and also occurs in many other places around the world. Photograph by A. S. Navoy.

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