This book is designed to introduce the principal geophysical phenomena and techniques-namely seismology, gravity, magnetism, and heat flow-to students whose primary training is in geology and who possess only a basic knowledge of physics. This text is appropriate for a variety of courses including Tectonics, Earthquake Seismology, Earthquake Geology, Reflection Seismology, and Gravity Interpretation, in addition to courses in Solid Earth Geophysics. Its abundant figures and exercises, combined with the straightforward, concise style of the text, put the essentials of geophysics well within reach of such readers.