hiː bˈækt ðə mˈuːvɪŋ ʌv kˈɑːntɪnənts pɹəpˈoʊzd baɪ ˈælfɹɪd vˈeɪɡənɚ ænd dᵻsˈaɪdᵻd ɔnðɪ ɛkspˈændɪŋ ˈɜːθ aɪdˈiə æz ðə mˈɛkənˌɪzəm fɔːɹ ðɪs ænd wʌzðə mˈeɪn pɹəpˈoʊnənt ʌv ðɪs haɪpˈɑːθəsˌɪs.
He backed the moving of continents proposed by Alfred Wegener and decided on the expanding Earth idea as the mechanism for this and was the main proponent of this hypothesis.