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.