This book reviews the cumulative evidence for a connection between the Earth's rotation and geotectonics. Satellite and plate-motion data in particular suggest that the rotation affects geotectonics. The author recasts the classical models of body tides and argues that the energy from the tides directs the otherwise random process of convection. Among other benefits, this model could prove an important step in deciphering the flow of the Earth's mantle. Introducing a more complete model of the tidal Earth than those orthodox until now, Bostrom points to the likelihood that a non-reversing term accounts for the remarkable contrast between the Earth and its sister planet Venus--including the existence of mobile plates and the preservation of liquid water.