Although gravity acting on materials on an over-steepened slope is the primary reason for a landslide, there are other contributing factors: rock and soil slopes are weakened as they are saturated by snowmelt or heavy rains erosion by rivers or ocean water at the base of slopes creates oversteepened slopes excess weight from accumulation of rain or snow, human stockpiling of materials earthquakes or machinery create ground shaking that makes weak slopes fail volcanic eruptions produce loose ash deposits, heavy rain, and debris flows USGS landslide web site Examples .
(gravity; acting; on materials on an over-steepened slope) (they; are saturated; by snowmelt or heavy rains) (gravity acting on materials on an over-steepened slope; is; the primary reason for a landslide) (shaking that; makes; weak slopes fail volcanic eruptions produce loose ash deposits, heavy rain, and debris) Context(shaking that makes,List([427, 445))):(weak slopes; fail; volcanic eruptions produce loose ash deposits, heavy rain, and debris) Context(shaking that makes weak slopes fail,List([427, 462))):(volcanic eruptions; produce; loose ash deposits, heavy rain, and debris) (human stockpiling of materials earthquakes or machinery; create; ground)
shaking that makes,List([427, 445)) shaking that makes weak slopes fail,List([427, 462))
gravity they gravity acting on materials on an over-steepened slope shaking that weak slopes volcanic eruptions human stockpiling of materials earthquakes or machinery
acting are saturated is makes fail produce create
on materials on an over-steepened slope
by snowmelt or heavy rains
the primary reason for a landslide
weak slopes fail volcanic eruptions produce loose ash deposits, heavy rain, and debris
volcanic eruptions produce loose ash deposits, heavy rain, and debris
loose ash deposits, heavy rain, and debris
ground