Beginning with basic principles, this advanced text gives a complete treatment of deformation and flow of earth materials from both the continuum mechanics and the microphysical viewpoints. It covers the role and consequences of rheological processes in geophysics and geodynamics in a quantitative and authoritative manner. The second edition of this successful text: provides the only unified treatment of the rheology of the Earth at this level, making it useful to students and researchers alike; includes discussions of seismology, mantle convection and plate tectonics; is completely up to date, providing a much needed account of thermal and mechanical processes in geodynamics.