The atolls are composed of live coral reefs and sand bars, situated atop a submarine ridge 960 kilometers long that rises abruptly from the depths of the Indian Ocean and runs from north to south.
环礁由活着的珊瑚礁和沙洲组成，生长在印度洋深处从南到北长贯960公里的陡峭海脊之上。
The levelness may be due to the subduction of a submarine mountain range known as the Juan Fernández Ridge.
板块的水平程度可能取决于一个被称为胡安 · 费尔南德斯脊的海底山脉的俯冲作用。
Acoustic instruments on the submarine told us that there was a ridge at the bottom of the ocean, sitting transverse to the flow of ice.
潜艇上的声波仪器告诉我们，在海洋底部有一道海脊，横向坐落在冰流方向上。
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