{"thcode":2,"term":{"code":61,"name":"asthenosphere","parent":690,"scope":"A layer of the earth within the upper mantle and directly below the lithosphere. This layer has a semi-solid consistency that reaches to about 200 kilometers (124 miles) below the surface."},"uf":[],"bt":[{"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."},{"code":292,"name":"earth structure","parent":287,"scope":"Major interior structural features of the planet earth."},{"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":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."}]}