The surface features of the Earth are commonly split into two categories, the first of which comprises those features that are due to processes occurring inside the solid Earth (endogenic features) and the second those that are due to processes occurring outside the solid Earth (exogenic features). Specifically, the endogenic features are treated in the science of geodynamics, the exogenic features in the science of geomorphology. I have treated the theoretical aspects of the endogenic features in my Principles of Geodynamics, and it is my aim to supplement my earlier book with a discussion of the theory of the exogenic features, the taxonomy of the latter having been discussed in my Systematic Geomorphology. It is my hope that the three books will together pre­ sent a reasonably coherent, if necessarily incomplete, account of theoretical geology. Contrary to endogenic phenomena, exogenic processes can often be directly observed as they occur: the action of a river, the develop­ ment of a slope, and the evolution of a shore platform are all suffi­ ciently rapid so that they can be seen as they take place. This has the result that in geomorphology one is generally on much less specula­ tive ground regarding the mechanics of the processes at work than one is in geodynamics.

1 Physical Geomorphology.- 1.1 Introduction.- 1.2 Development of Slopes.- 1.3 Curved Lines in Geomorphology.- 1.4 Fluvial Geomorphology.- 1.5 Morphology of Landscape Systems.- 1.6 Aquatic Morphology.- 1.7 Glacial and Periglacial Morphology.- 1.8 Aeolian and Desert Morphology.- References Chapter I.- 2 Physical Background.- 2.1 Introduction.- 2.2 Dynamics of Flowing Water.- 2.3 Geocryology.- 2.4 Physics of the Atmosphere.- 2.5 Problems of Climate.- References Chapter 2.- 3 Mechanics of Slope Formation.- 3.1 Principles.- 3.2 Reduction of Rocks.- 3.3 Spontaneous Mass Movements on Slopes.- 3.4 External Transporting Agents.- 3.5 Mathematical Models of Denudation.- References Chapter 3.- 4 Theory of River Action.- 4.1 General Remarks.- 4.2 Linear Flow in Open Channels.- 4.3 Three-Dimensional Flow in Open Channels.- 4.4 Forces of Fluids on Particles.- 4.5 Sediment Transportation.- 4.6 Mutual Interaction of Bed, Flow, and Sediment Transport.- 4.7 Planar Aspects of River Flow.- 4.8 Valley Formation.- References Chapter 4.- 5 System Theory of Landscape Evolution.- 5.1 Introduction.- 5.2 Fundamental Principles of Landscape Evolution.- 5.3 General System Theory.- 5.4 System Theory and Drainage Basins.- 5.5 Simulations of Landscapes.- References Chapter 5.- 6 Theory of Aquatic Effects.- 6.1 General Remarks.- 6.2 Movements in Large Bodies of Water.- 6.3 Aquatic Effects on Land.- 6.4 Theoretical Coastal Morphology.- 6.5 Dynamics of River Mouths.- 6.6 Theoretical Submarine Geomorphology.- References Chapter 6.- 7 Theory of Niveal, Glacial, and Periglacial Features ...- 7.1 Introduction.- 7.2 Snow Problems.- 7.3 Ice Problems.- 7.4 Theory of Glaciohydrological Effects.- 7.5 Theory of Geocryological Features.- References Chapter 7.- 8 Theory of Aeolian and Desert Features.- 8.1 Introduction.- 8.2 Theory of Aeolian Features.- 8.3 Specific Desert Features.- 8.4 Semidesert Features.- References Chapter 8.