A well-layered Earth



Shortly after its accretion, Earth was both hot and heterogeneous, according to Don Anderson of the Seismological Laboratory at the California Institute of Technology (Caltech) in Pasadena, President-Elect of AGU. In a talk to be presented at the 1987 AGU Fall Meeting in San Francisco, Anderson draws on advances in seismology, petrology, and geochemistry for a hypothesis that Earth's mantle has been well differentiated, made up of concentric layers of different kinds of rock, throughout its history.