{"thcode":2,"term":{"code":1325,"name":"well drilling","parent":775,"scope":"The process of artificial excavation for the purpose of withdrawing water, oil, or gas from underground."},"uf":[],"bt":[{"code":775,"name":"natural resource extraction","parent":1174,"scope":"Removal of natural materials or properties (such as heat) for use."},{"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":281,"name":"drilling and coring","parent":379,"scope":"Cutting into the subsurface, for example into underground strata, ice, or a tree trunk, to remove material for examination. Intended for broad use wherever coring is done. The combination of this term with other terms will convey the context of the activity."}]}