hɪz haɪpˈɑːθəsˌɪs ɡˈeɪv ðə mˈɛkənˌɪzəm fɔːɹ ðɪs æz ɐn ɛkspˈændɪŋ ˈɜːθ; wˈɛɹæz ðə nˈuː haɪpˈɑːθəsˌɪs ʌv plˈeɪt tɛktˈɑːnɪks ɐkˈaʊntᵻd fɔːɹ ɪt wɪð sʌbdˈʌkʃən.
His hypothesis gave the mechanism for this as an expanding earth; whereas the new hypothesis of plate tectonics accounted for it with subduction.