This is part of the system of mid-ocean ridges that form as the tectonic plates of the Earth's crust move apart-a process known as seafloorspreading.
印度洋脊是中大洋脊的一部分，中大洋脊是地壳分离的地球板块形成的。这一形成过程被称为海底扩张。
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They called their theory "seafloorspreading." the theory explains that as the seafloor spreads, the tectonic plates are pushed and pulled in different directions.