Tectonics of the terrestrial planets

Relevant facts of rock mechanics and classes of tectonic models are summarized. For each, specific predictions of observable features are indicated; next the evidence on the terrestrial planets is reviewed and related to the models. There appears to be an excellent inverse correlation of tectonic activity with lithosphere thickness, which is in turn controlled by radius, age, and atmosphere. Thermal expansion, elasticity, faulting, and dislocation creep are discussed in connection with rock mechanics; nonuniform contraction, despinning, volcanism, isostatic adjustment, and convection are explained. 62 references