At the moment, The Structure of the Terrestrial Planets discusses the structures of those planets by covering the structure of the Earth in some detail, then comparing the overall properties of the other planets to those of the Earth to make predictions about their structure. It would probably be better to discuss the structure of the Earth separately, then provide links to discussions of the other planets. This page serves as a placeholder for a future transformation to that way of handling things; for now, please refer to the existing page using the link in the first sentence.