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 Man Who Was Superman caused a seizure, causing him to collapse on the road. As he writhed on the ground in pain, the car exploded with his daughter still inside. None of the onlookers in the crowd attempted to help Lee or his daughter. It was at this moment when mental trauma caused Lee to believe he was Superman. Lee lives his life with the belief that he is indeed Superman. Soo-jung follows Lee around as he attempts to help the community in his bizarre fashion. With his "super-deeds" Lee inspires hope within the community and people begin to follow his example. But this