sinkhole -- n. A natural depression in the surface of the land caused by the collapse of the roof of a cavern or subterranean passage, generally occurring in limestone regions.
soil -- Unconsolidated materials above bedrock.
Sinkhole:
Crater formed when the roof of a cavern collapses; usually found in areas of limestone rock.
sinkhole Depression in ground surface caused by collapse into a cave below.
sinking stream A stream that empties into the underground into a cave, usually through a sinkhole.
(2) Another name for sinkhole. Sinkhole A pit like hole in found in areas of karst. These features are caused by the weathering of limestone or dolomite by subsurface drainage. Also called a sink or doline.
depression Input map: Map layer of actual depressions or sinkholes in the landscape that are large enough to slow and store surface runoff from a storm event. Any non-zero values indicate depressions. flow Input map: amount of overland flow per cell.
Sinkhole:
A depression in the land surface that results from the collapse or slow settlement of underground voids produced by solution weathering. The rock being dissolved is normally limestone but can also be salt, gypsum or dolostone.
Karst topography encompasses a variety of landforms, such as solution valleys, sinkholes, subterranean caves, and towers, which develop largely by chemical dissolution of limestone rocks. Solution often begins in and extends from structural joints.
Sinkholes A localized depression in the surface topography, usually caused by the collapse of a subterranean structure, such as a cave.
Large areas are subject to extreme weather such as (tropical cyclones), hurricanes,or typhoons that dominate life in those areas. Many places are subject to earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, floods, droughts, ...
A final type of contour that may appear on a topographic map is a line representing a closed depression (such as a sinkhole or a crater at the top of a volcano).
Fractures within the Silurian formations permit groundwater flow and subsequent dolomite dissolution, producing caves and sinkholes. Visocky et al.
 See also: Surface, Area, Region, Slope, Map
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