Geophysics S-waves in the outer core. This indicates that the outer core is liquid, because liquids cannot support shear. The outer core is liquid, and the motion of this highly conductive fluid generates the Earth's field. The inner core, however, is solid because of the enormous pressure. Reconstruction of seismic reflections in the deep interior indicate some major discontinuities in seismic velocities that demarcate the major zones of the Earth: inner core, outer core, mantle, lithosphere and crust. The mantle itself is divided into the upper mantle, transition zone, lower mantle and "D′′" layer. Between the crust and the mantle is
Bulletin of Engineering Geology and the Environment and groundwater conditions of geological formations; characterization of the mineralogical, physico-geomechanical, chemical and hydraulic properties of earth materials involved in construction, resource recovery and environmental change; assessment of the mechanical and hydrological behavior of soil and rock masses; prediction of changes to the above properties with time; determination of the parameters to be considered in analyzing the stability of engineering works and earth masses; maintenance of the environmental condition and properties of the terrain. Bulletin of Engineering Geology and the Environment The Bulletin of Engineering Geology and the Environment is a peer-reviewed scientific journal covering research in geoscience. It is