"Plate Tectonics is a primer on the scientific theory that provides a single guiding principle to the Earth's geologic history: that a number of mobile lithospheric plates are continuously changing and rearranging the face of the Earth." "Plate Tectonics includes an extensive index, a glossary of terms (many of which include pronunciation guides) to help readers better understand the vocabulary of geology, and a bibliography of current sources for further research."--BOOK JACKET.