avalanchea mass of snow, ice, and debris falling rapidly down a mountainsideBackcountry skiers must assess avalanche risk before venturing into steep, snow-covered terrain.NoteBackcountry skiers must assess avalanche risk before venturing into steep, snow-covered terrain.Elon.io is an online learning platformWe have an entire course teaching TOEFL Academic Vocabulary grammar and vocabulary.Start learning TOEFL Academic Vocabulary now