1 Introduction.- Mountains and Human Affairs.- Mountains and the Concepts of Mechanics.- 2 Strains and Displacements.- Linear Strain.- Change of Area and Volume.- Variation of Linear Strain with Direction.- Shear Strain.- Variation of Shear Strain with Direction.- Laminar Materials.- Cumulative Shear Strain.- Linear Strain in Laminar Behavior.- Change of Strain from Point to Point.- Folding.- Surface Waves.- The Mohr Circle and Partition of Strain.- The Mohr Circle.- Change of Area, Change of Shape.- Answers.- 3 Forces and Stresses.- Relating Forces and Pressures to Daily Experience.- Relating Pressure to Depth.- Force Balance, Weight Versus Pressure.- Force Balance, Shear Stress Versus Weight.- Force Balance, Shear Stress Versus Pressure.- Force Balance: Shear Stress, Weight, and Pressure.- Summary and Generalizations.- Stresses at an Interface.- Planes Oblique to Each Other.- Change of Stress from Point to Point.- Stress Fields.- Answers.- 4 Variation of Stress with Direction.- Stress on Oblique Planes.- Mohr Circle and Sine-Wave Diagram for Stresses.- Summary of Stress Relations.- Refraction of Stress.- Stress Relations in Three Dimensions.- Answers.- 5 Rheology: Relations Between Forces and a Material's Response.- Shear Stress, Shear Strain, and Viscosity.- Summary and Comment.- Relation of GTU and GVU to Standard Units.- Normal Stresses and Linear Strains.- Summary and Comment.- A Rock Has Variable Viscosity.- Variation in Shear Stress.- Principal Stress Inclined to an Interface.- Refraction.- Alternating Multilayers And Anisotropy.- Straight-Limbed Folds.- Behavior of Multilayers.- Change of Volume.- Permeability.- Nonuniform Pressure Gradients.- Direction of Shortening and Direction of Escape.- Summary.- Answers.- 6 Parting.- Two Kinds of Parting: The Failure Envelope.- Attitudes of Faults and Fractures.- Inhomogeneous Rock and Thrust Sheets.- Effect of Pore Fluid on Parting.- Answers.- 7 Concurrent Fracture and Flow.- Links Between the Processes.- A Mohr Diagram for Flow Behavior.- Effect of Pore Fluid on Flow Behavior.- Concluding Example: The Pyrenees.- Answers.- Appendices.- A. List of Abbreviations.- B. Precision and Significant Figures.- C. Weights as Units of Force.- D. Experimental Work on Rock Deformation.- E. Books on Related Material.