Landslide is the downward falling or sliding of a mass of soil, detritus, or rock on or from a steep slope. Many kinds of events can trigger a landslide, such as the over steepening of slopes by erosion associated with rivers, glaciers, or ocean waves; heavy snowmelt which saturates soil and rock; or earthquakes that lead to the failure of weak slopes.
             Gravity is the ultimate force behind any landslide and that weathering plays a part. Land surfaces are held together by multiple forces. The most important of these is friction. Some soil particles, like clay, cling to each other tightly, while others, like sand, are only loosely joined. All landscapes are held together by friction between the sediment cover and the underlying bedrock, some more tightly than others. If something is introduced to disrupt the friction on an incline, a landslide slips into action. Landslides occur when gravity overcomes the force of friction. If the Earth's crust vibrates enough to disrupt the force of friction holding sediments in place on an incline, a landslide can strike.
              Stay away from the landslide area as there may be danger of additional slides. Do not drive through. Do not build on or at the base of unstable slopes, on or at the base of minor drainage hollows, at the base or on top of an old fill slope, at the base or top of a steep cut slope. Make an evacuation plan in case of a landslide with all the emergency items.

A Landslide



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