Explained: Why mountains in Himachal are rolling down Wed, Aug 4 2021 13:51 IST | 0 Views Explained: Why mountains in Himachal are rolling down. Image Source: IANS News Shimla, Aug 4 : While cloudbursts and flash floods in recent years have become a regular feature in the hill state of Himachal Pradesh, the loss of life caused by natural calamities can be mainly attributed to the increasing human interference, particularly in eco-sensitive Himalayan zones. Experts told IANS on Wednesday that since mountains in Himachal Pradesh are part of Himalayan range that are young and fragile in nature, creating cracks and fractures in the rock could widen in future and create a rockfall or slope failure zone -- a phenomenon in which a slope collapses abruptly under the influence of rainfall or an earthquake.