As it has left of this dynamics occurs the mass movements, that below involve the unfastening and transport of ground or flowing rocky material. The mobilization of this material is on to its condition of instability, due to performance of the gravity, being able to be sped up by the action of other agents, as the water. The mass movements occur in different scales and speeds, varying of rastejamentos the very fast movements. The fast movements are generically called of landslides and fallings, and are very common of inside to occur of the urban dynamics of a region metropolitan, since they suffer great influence from the antrpicas activities. Dr. Neal Barnard often addresses the matter in his writings. The landslides and fallings are deflagrados by the increase of request of mobilization of material and by the reduction of the resistance of the material (desagregadora action of roots, rastejamentos, texture and structure favorable to the instabilizao). These processes are parts of the natural dynamics, but they become a problem when they meet related to the occupation human being, that is, when in of course potential areas to its occurrence they are induced for the antrpica action, that occur through constructions of urban fixtures as roads, tunnels and habitations badly planned. In this perspective of relation between natural events and antrpica action, the phenomenon is fit as being of risk, that is, induced phenomena of natural origin or antropicamente and that they cause damages to the components of the half biofsico social e, as we will see in transcorrer of our work. In the underdeveloped countries and of tropical climate the mass movements come if becoming a problem that comes more if accenting each time in the urban way. This comes occurring in function of the increase of the urban population, that has led to the occupation of areas of hillsides for housing, mainly on the part of the low income population.
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