{"thcode":2,"term":{"code":292,"name":"earth structure","parent":287,"scope":"Major interior structural features of the planet earth."},"uf":[],"bt":[{"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":[{"code":211,"name":"core (earth)","parent":292,"scope":"The superdense center of the earth composed of two layers: a liquid outer layer and a solid inner core of metallic iron-nickel alloy."},{"code":219,"name":"crust (earth)","parent":292,"scope":"The outermost layer of the earth which is relatively thin, of lower density than the core, and rocky."},{"code":690,"name":"mantle (earth)","parent":292,"scope":"Zone of earth's interior between the crust and the core.  It is 2,900 kilometers (1,740 miles) thick and consists of a dense upper layer (upper mantle) and a partially molten lower layer (lower mantle), separated by a transition zone."}],"rt":[{"code":459,"name":"geologic structure","parent":287,"scope":"General position of rocks in an area, and geometrical relationships among rocks."},{"code":1117,"name":"structural geology","parent":464,"scope":"Branch of geology concerned with the distribution, position, shape, and internal structure of rocks."},{"code":1145,"name":"tectonic processes","parent":451,"scope":"The structural forces affecting the deformation, uplift, and movement of the earth's crust."},{"code":1147,"name":"tectonophysics","parent":470,"scope":"Branch of geophysics concerned with the structural forces affecting the deformation, uplift, and movement of the earth's crust."}]}