ˌoʊvɚ ðə pˈæst mˈɪliən jˈɪɹz, ðɛɹ hɐvbɪn ɐ nˈʌmbɚɹ ʌv vˈɛɹi stɹˈɔŋ ɡlˈeɪʃəl mˈæksɪmə ænd mˈɪnɪmə, spˈeɪst baɪ ɹˈʌfli wˈʌnhˈʌndɹɪd kˈaɪ.
Over the past million years, there have been a number of very strong glacial maxima and minima, spaced by roughly 100 ky.