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A topographic map of Stowe, Vermont with contour lines This false-color satellite image illustrates topography of the urban core of the New York metropolitan area, with Manhattan at its center. Topography is the study of the forms and features of land surfaces .
The Red Lake sinkhole in Croatia. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet.
Area of subsidence caused by the collapse of an underlying structure, such as sinkholes in karst terrain. Sink: an endorheic depression generally containing a persistent or intermittent (seasonal) lake, a salt flat (playa) or dry lake, or an ephemeral lake. Panhole: a shallow depression or basin eroded into flat or gently sloping, cohesive rock ...
Sinkholes can range in size from a few feet wide to hundreds of acres, and anywhere from 1 to 100 feet or more deep. Sinkholes can swallow up cars, parts of roads and even houses.
2018 Surabaya City sinkhole – a 30 m (98 ft) wide and 15 m (49 ft) deep sinkhole opened up on Gubeng Road in Surabaya, Indonesia during construction work on December 18, 2018. 2022 Tierra Amarilla sinkhole – a 25 m (80 ft) wide and more than 200 m (700 ft) deep sinkhole appeared in the commune of Tierra Amarilla , Atacama Region of Chile ...
Authorities fear a woman in western Pennsylvania who disappeared while looking for her cat may have been swallowed by a sinkhole — a phenomenon likely caused by mine subsidence. Search and ...
A topographic survey is typically based upon a systematic observation and published as a map series, made up of two or more map sheets that combine to form the whole map. A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map ...
Large-scale topographic map from TopoQuest; Bing Maps: The Pipe Creek Sinkhole; Farlow, James O. et al. (eds.), Geology of the Late Neogene Pipe Creek Sinkhole (Grant County, Indiana), Indiana Geological Survey Special Report 69, January 2010. Retrieved 21 October 2014.