Name 4 things that can create a landslide?

Question

please help im in class

Answer 1

What causes landslides?  

Some slopes are susceptible to landslides whereas others are more stable. Many factors contribute to the instability of slopes, but the main controlling factors are the nature of the underlying bedrock and soil, the configuration of the slope, the geometry of the slope, and ground-water conditions .

Three distinct physical events occur during a landslide: the initial slope failure, the subsequent transport, and the final deposition of the slide materials. Landslides can be triggered by gradual processes such as weathering, or by external mechanisms including:

bullet Undercutting of a slope by stream erosion, wave action, glaciers, or human activity such as road building,

bullet Intense or prolonged rainfall, rapid snowmelt, or sharp fluctuations in ground-water levels,

bullet Shocks or vibrations caused by earthquakes or construction activity,

bullet Loading on upper slopes, or

bullet A combination of these and other factors.

Once a landslide is triggered, material is transported by various mechanisms including sliding, flowing and falling. Landslides often occur along planes of weakness that may parallel the hill slope. In bedrock, planes of weakness are usually beds, joints or fractures. Soils such as silt and clay are weaker than rock and commonly have complex or multiple planes of weakness.