Question

What is a land-slide?
Why do land-slides occur?
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Answer 1

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A landslide occurs because the force of gravity becomes greater than either friction or the internal strength of the rock, soil, or sediment. The amount of friction between a deposit of rock or soil and the slope that it rests on plays a large role in when landslides happen.

Answer 2

Answer:

• A landslide is defined as the movement of a mass of rock, debris or earth down a slope. Landslides are a type of "mass wasting", which denotes any down-slope movement of soil and rock under the direct influence of gravity.

• Landslides can be initiated in slopes already on the verge of movement by rainfall , snowmelt , changes in water level, steam erosion, changes in ground water , earthquakes, volcanic activity, disturbance by human activities or any combination of these factors.

Hope it's help.