Question

project on causes of landslide​

Answer 1

Answer:

A landslide is any geologic process in which gravity causes rock, soil, artificial fill or a combination of the three to move down a slope.

Several things can trigger landslides, including the slow weathering of rocks as well as soil erosion, earthquakes and volcanic activity.

Answer 2

Natural Causes of Landslides:

1. Climate : Long-term climatic changes can significantly impact soil stability. A general reduction in precipitation leads to lowering of water table and reduction in overall weight of soil mass, reduced solution of materials and less powerful freeze-thaw activity. A significant upsurge in precipitation or ground saturation would dramatically increase the level of ground water. When sloped areas are completely saturated with water, landslides can occur. If there is absence of mechanical root support, the soils start to run off.
2. Earthquakes : Seismic activities have, for a long time, contributed to landslides across the globe. Any moment tectonic plates move, the soil covering them also moves along. When earthquakes strike areas with steep slopes, on numerous occasion, the soil slips leading to landslides. In addition, ashen debris flows instigated by earthquakes could also cause mass soil movement.
3. Weathering : Weathering is the natural procedure of rock deterioration that leads to weak, landslide-susceptive materials. Weathering is brought about by the chemical action of water, air, plants and bacteria. When the rocks are weak enough, they slip away causing landslides.
4. Erosion : Erosion caused by sporadic running water such as streams, rivers, wind, currents, ice and waves wipes out latent and lateral slope support enabling landslides to occur easily.
5. Volcanoes : Volcanic eruptions can trigger landslides. If an eruption occurs in a wet condition, the soil will start to move downhill instigating a landslide.Stratovolcano is a typical example of volcano responsible for most landslides across the globe.
6. Forest fires : Forest fires instigate soil erosion and bring about floods, which might lead to landslides
7. Gravity : Steeper slopes coupled with gravitational force can trigger a massive landslide.