Scientists have made new inroads in the study of the Earth's deep interior. They have forged developments in this fascinating arena using experimental and observational techniques, . including seismology, monitoring of the Earth's rotation, geomagnetism, and accurate measurements of Earth's gravity fields. These techniques along with more theoretical skills such as building numerical models and studying high-pressure physics, were discussed at the 7th annual SEDI symposium. Leading scientists in the field presented papers, which are now collected in this volume. Earth's Core and Lower Mantle brings a broad range of expertise to postgraduates and researchers in this area of geophysics.