According to the article above Himalayan soil has very poor stability, hence the best way to prevent landslides is to:
(i) provide proper drainage to dispose the household water particularly in slide prone areas.
(ii) Build check dams to control surface runoff and improve the moisture condition for the growth of vegetation.
(iii) Planting fast growing grasses and bushes in the landslide area.
(if) All of the above
Answers
Answer: Landslides and other mass movements are serious geo-environmental hazards in the Himalayas. Massive landslides killing tens of thousands of people with catastrophic damages have occurred in the Eastern Himalayan State of Sikkim, which shares common borders with Tibet, Nepal, and Bhutan. This paper describes the investigations carried out on recent landslides in Gangtok, Sikkim, India, with emphasis on the triggering mechanisms that have contributed to the release and creep of natural slopes in the region. It is believed that the intense rainfall in the region not only contributes to rapid erosion and weathering of the rock mass, but also increases the groundwater level that leads to reduction in the stability of natural slopes. A landslide instrumentation programme that includes placement of settlement pillars and piezometers is underway to predict the behaviour of landslides in the area.
Explanation: