{"thcode":2,"term":{"code":2031,"name":"karst","parent":626,"scope":"Landscape characterized by dissolution features in carbonate or evaporite terranes, often containing caves and sinkholes."},"uf":[{"name":"karst topography","usewith":false},{"name":"karstic","usewith":false}],"bt":[{"code":626,"name":"land surface characteristics","parent":287,"scope":"Features and attributes of earth's land surface."},{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":1750,"name":"sinkhole formation","parent":353,"scope":"Localized collapse of the land surface usually due to erosion of the underlying materials.  Most commonly occurring in karst areas, but similar effects occur due to physical erosion in other terranes."}]}