The document discusses the deformation of rock crust through various tectonic processes. It defines deformation as the process by which crust is deformed along plate margins, producing geologic structures like folds, faults, joints and foliation. It describes how different rock types deform under stress through either ductile or brittle deformation. The key types of deformation discussed are folding, where layers of rock are bent, and faulting, where connected blocks of rock are displaced along a fracture plane. Common fold types include anticlines, synclines and monoclines. Fault types include normal, reverse, strike-slip and oblique-slip faults.