This is a temperature-at-depth model for the conterminous Untied States, at 0 kilometers. It involves multiple physical quantities, such as bottomhole temperature, depth and spatial coordinates, heat flow, thermal conductivity, elevation, sediment thickness, magnetic anomaly, gravity anomaly, and gamma-ray flux of radioactive elements. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.