wat four forces may combine to form a landslide?

Question

is it minor earthquake, volcanoes, gravity, and erosions from rivers, rain, glacuiers, or ocean water???

Answer 1

The fundamental force is gravity, obviously. Landslides may result from earth shaking due to earthquake, undermining of the base of a slope by erosion, addition of material to the slope from many sources, and even increased pore pressure in the soil due to wet conditions.

Answer 2

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:

Undercutting of a slope by stream erosion, wave action, glaciers, or human activity such as road building,
Intense or prolonged rainfall, rapid snowmelt, or sharp fluctuations in ground-water levels,
Shocks or vibrations caused by earthquakes or construction activity,
Loading on upper slopes, or
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.

Answer 3

1.Steep hill side.
2.No vegetation to hold the soil in place.
3. lots of rain or earthquakes.
4.Some idiot building his home on the down hill side.