Look at Fig. 4-27 carefully, seeing what the axes represent, and how the five main types of flows relate to each. Creep and solifuction are slow flows. World weathering regions. The focus will be on debris flows.
Debris flow is a large and very important category.
Debris flows are a significance hazard in Oregon. If you are interested in problems and policies about debris flows in Oregon, go to the page on debris flows for more information. This type is usually faster and more hazardous. These are the type of debris flows that are of concern in Oregon right now. We will not cover evolution of hillslopes in lecture or tests, but this section makes interesting reading.