Their birth is announced suddenly when large masses of snow, ice, earth, rock, and other materials, such as tree trunks, cascade swiftly down a mountainside or over a precipice, often destroying everything in their path.
Tās rodas pēkšņi, kad lielas sniega un ledus masas, kas rauj līdzi zemi, akmeņus, koku stumbrus un citus priekšmetus, sāk strauji slīdēt lejup pa kalna nogāzi vai gāzties no kraujas, noslaukot visu savā ceļā.