Question

what are landslides. how it occurs.

Answer 1

When earthquakes occur on areas with steep slopes, many times the soil slips causing landslides. Furthermore, ashen debris flows caused by earthquakes can also trigger mass movement of soil. Heavy Rainfall: When sloped areas become completely saturated by heavy rainfall many times landslides can occur.
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Answer 2

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Here's the required answer:-

Landslide is some form of mass wasting including a wide range of ground movements(rockfall,etc.) These can occur because of ground movements beneath the Earth.