Sinkhole urban areas due to water main breaks or sewer collapses when old pipes give way. They can also occur from the overpumping and extraction of groundwater and subsurface fluids. Sinkholes can also form when natural water-drainage patterns are changed and new water-diversion systems are developed. Some sinkholes form when the land surface is changed, such as when industrial and runoff-storage ponds are created; the substantial weight of the new material can trigger a collapse of the roof of an existing void or cavity in the subsurface, resulting in development of a sinkhole. Sinkholes tend to occur in karst landscapes. Karst
A Void A Void A Void, translated from the original French La Disparition (literally, "The Disappearance"), is a 300-page French lipogrammatic novel, written in 1969 by Georges Perec, entirely without using the letter "e" (except for the author's name), following Oulipo constraints. It was translated into English by Gilbert Adair, with the title A Void, for which he won the Scott Moncrieff Prize in 1995. Three other unpublished English translations are titled A Vanishing by Ian Monk, Vanish'd! by John Lee, and Omissions by Julian West. The book has also been translated into German (by Eugen Helmlé as Anton Voyls Fortgang, 1986),