ocean floor spreading

基本解釋

The sea floor is spreading away from the mid-ocean ridges.
海底正在從大洋中脊擴(kuò)張開來。
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 sea floor spreading.
印度洋脊是中大洋脊的一部分，中大洋脊是地殼分離的地球板塊形成的。這一形成過程被稱爲(wèi)海底擴(kuò)張。
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 sea floor spreading.
那裡是海洋中脊系統(tǒng)中的一部分，而大洋中脊形成於板塊漂移與海牀擴(kuò)展。