In turn, the natural history of the Earth caused parts of this planet to have differing concentrations of the elements.
ɪn tˈɜːn, ðə nˈætʃɚɹəl hˈɪstɚɹi ʌvðɪ ˈɜːθ kˈɔːzd pˈɑːɹts ʌv ðɪs plˈænɪt tə hæv dˈɪfɚɹɪŋ kˌɑːnsəntɹˈeɪʃənz ʌvðɪ ˈɛlɪmənts.