Sinkhole
Sinkhole (English: sinkhole) or Dorine (German: Doline) is a cave hole which occurs when the surface layer collapses due to the development of cavities in the limestone / dolomite area. Doline is derived from the Serbian dolina, which means the valley, and sinkhole, which means the sinking hole, is used in English. The sink hole under the sea surface is called a blue hole. The sinking hole found in the low flat limestone zone of the Yucatan Peninsula is named Cenote and it is a natural well / spring with underground water pool. There are cases where the water supply and sewer pipes buried in the road are broken and water leaks and the ground collapses and there is a case where the ground collapses and the groundwater goes out by the excavation accompanying the construction of the high rise building and the hole sinks causing the hole to pierce, to be called. In the Republic of Korea, there are increasing number of sink holes arising from artificial factors in recent years, which is a social problem. ...