Question

in thick forests also landslide happens .can you find the reason

Answer 1

While landslides are considered naturally occurring disasters, human-induced changes in the environment have recently caused their upsurge. Although the causes of landslides are wide ranging, they have 2 aspects in common; they are driven by forces of gravity and result from failure of soil and rock materials that constitute the hill slope:

Natural Causes of Landslides

Climate

Long-term climatic changes can significantly impact soil stability. A general reduction in precipitationleads to lowering of water table and reduction in overall weight of soil mass, reduced solution of materials and less powerful freeze-thaw activity.

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. 

Weathering

Weathering is the natural procedure of rock deterioration that leads to weak, landslide-susceptive materials

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.

Volcanoes

Volcanic eruptions can trigger landslides. If an eruption occurs in a wet condition, the soil will start to move downhill instigating a landslide.

Forest fires

Forest fires instigate soil erosionand bring about floods, which might lead to landslides

Gravity

Steeper slopes coupled with gravitational force can trigger a massive landslide.

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