The Bagmati River is the principle river which originates at Baghdwar (Bagh-Tiger, Dwar-Door) just below the summit of Shivapuri hill which lies in the northern part of Kathmandu valley in central Nepal. The length of the Bagmati River is around 196 KM in India. The source of the Sutlej River is near Lake Rakshastal in Tibet. Ghaghara originates in glaciers of Mapchachungo on the Tibetan Plateau near Lake Mansarovar, cuts through the Himalayas in Nepal and joins the Sarda River at Brahmaghat in India.
The useful steps to prevent soil erosion are Afforestation, Contour Ploughing, Prohibition of shifting cultivation, Flood control, Restoration of long fallow, reclamation of alkaline and saline soil.
An avalanche is a sudden flow of snow down a slope, such as a mountainside. The first statement is correct because Himalayan range experiences more avalanches than any other place on Earth. Second statement is also correct because snowmobile leads to to avalanches if slab is not well anchored to the ground, leading to severe avalanche conditions.