Thanks very much, , for the kind words and for stopping by too. I do appreciate.
Well, as expected erosion is not favorable to slope. Usually, they wash away the foot of the slopes by either saturating the soil thus making them liable to being wash further, or simply pushing the soil outrightly away from the slope's foot by its force. Either event render the slope unstable and by virtue of gravitational force, soils immediate above the washed soil settles to replace them and these are washed too. This condition instantaneously triggers futher soil sliding down in order to balance the slope; landslide results.
Often times, to prevent this walls called retaining walls are built just at the foot of slides to ensure that such does not occur...
RE: Slope Stabilization and the Mass Wasting Phenomenon