kola superdeep borehole earth's inner core structure of earth abundance of elements in earth's crust earth's crust earth's mantle mantle (geology) earth's outer core dynamo theory project mohole planetary core iron–nickel alloy large low-shear-velocity provinces expanding earth core–mantle boundary sial sima (geology) pedosphere bertha rogers lower mantle ( earth) diapir chikyū seismic tomography transition zone ( earth) san andreas fault observatory at depth brittle–ductile transition zone lehmann discontinuity earth physical characteristics tables inner core super-rotation low-velocity zone ductility ( earth science) preliminary reference earth model earth's critical zone core–mantle differentiation
Nature_Earth