ɪntɹˈuːʒənz: ðə wˈeɪt əvə sˈɜːfɪs ɡlˈeɪʃɚ pˈɜːtʃt ɐtˈɑːp ɐ kˈeɪv ˈɛntɹəns kæn fˈoːɹs ɡlˈeɪʃəl ˈaɪs ɐ ʃˈɔːɹt dˈɪstəns ˌɪntʊ ðə kˈeɪv.
Intrusions: The weight of a surface glacier perched atop a cave entrance can force glacial ice a short distance into the cave.