erosion◼◼◼[UK: ɪ.ˈrəʊʒ.n̩] [US: ɪˈro.ʊʒ.n̩] weathering◼◻◻[UK: ˈwe.ðər.ɪŋ] [US: ˈwe.ðər.ɪŋ] abrasion◼◻◻[UK: ə.ˈbreɪʒ.n̩] [US: ə.ˈbreɪʒ.n̩] break◼◻◻[UK: breɪk] [US: ˈbreɪk] scour◼◻◻[UK: ˈskaʊə(r)] [US: ˈskaʊər] opening◼◻◻[UK: ˈəʊ.pən.ɪŋ] [US: ˈoʊ.pən.ɪŋ] | 