Derivation of ray parameter and extraction of velocity-depth relations. Free oscillations Density Distribution within the Earth. Chondritic abundance of the elements. Cosmochemical classification of the elements and comparison with geochemical classification. Definition of refractory, moderately volatile, siderophile, highly volatile elements.
Condensation benchmarks for classification.
Origin of the solar system Models for origin of the solar system. Collapse of part of molecular cloud to form accretion disk. Nebular models Formation of protosun, accretion of planets. Importance of knowledge of bulk silicate Earth. Composition determined from mantle xenoliths.