Plate tectonic theory has revolutionized the study of the history of our planet. It is now becoming increasingly apparent that processes deep within the Earth's mantle and core strongly influence plate movements, and it is to these processes that the author addresses himself. Having discussed the origin, composition, structure and physical properties of the Earth, the book turns to discuss the key role that interactions between the mantle and core play in magmatic and tectonic processes. Other important issues discussed are the nature and existence of mantle plumes and convection cells, and...