ðɪs ɪz ɐ dʒˌɪəlˈɑːdʒɪkli ˈæktɪv pɹˈɑːsɛs wˌɛɹ ðə ɡlˈeɪʃɚ kəntˈɪnjuːz tə ɡɹˈædʒuːəli ɪɹˈoʊd ðə vˈæli sˈaɪdz.
This is a geologically active process where the glacier continues to gradually erode the valley sides.