{"thcode":2,"term":{"code":1081,"name":"soil sciences","parent":291,"scope":"Earth sciences dealing with the origin, classification, physical, chemical, and biological properties of soils."},"uf":[{"name":"pedology (soils)","usewith":false}],"bt":[{"code":291,"name":"earth sciences","parent":1019,"scope":"Broad term for all science related to the study of the earth."},{"code":1019,"name":"sciences","parent":1,"scope":"Major educational fields, fields of study, and professional groupings within USGS."},{"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":1078,"name":"soil chemistry","parent":437,"scope":"Branch of chemistry concerned with the elements and compounds that make up soils. Includes chemical processes involving soils."},{"code":2044,"name":"soil horizons","parent":1199,"scope":"Layers in soil defined by physical, chemical, biological, or mineralogical properties which vary with depth."},{"code":1080,"name":"soil resources","parent":777,"scope":"Natural resources of unconsolidated fragmented rock, humus, and mineral matter that cover the surface of the earth."},{"code":1189,"name":"trenching","parent":379,"scope":"Field method used by earth scientists to study the underground structure of an area. A long narrow ditch is dug to locate geologic features, such as a fault."}]}