Galicia PAU Geology And Environmental Sciences Practice Questions - Galicia PAU Geology And Environmental Sciences Geología Y Ciencias Ambientales Exam

A compositional boundary separating the silicate crust from the denser peridotitic mantle, marked by a sharp increase in P-wave velocity. A thermal boundary between the rigid lithosphere and the ductile asthenosphere where partial melting decreases P-wave velocity. A phase-transition boundary between spinel and perovskite crystal structures within the mantle transition zone. A liquid-solid phase boundary separating the iron-nickel outer core from the solid inner core.