As the valley glacier moves, abrasion and plucking erode the protruding tips of the spurs, leaving steep cliff-like truncated spurs.
æz ðə vˈæli ɡlˈeɪʃɚ mˈuːvz, ɐbɹˈeɪʒən ænd plˈʌkɪŋ ɪɹˈoʊd ðə pɹətɹˈuːdɪŋ tˈɪps ʌvðə spˈɜːz, lˈiːvɪŋ stˈiːp klˈɪflˈaɪk tɹˈʌŋkeɪɾᵻd spˈɜːz.