海底峡谷，是由于地壳板块运动而形成的一种地质构造。
Submarine canyon is a geological structure that formed by plate movement in the crust.
这些火山没有一个是由于火星地壳板块之间的碰撞而形成的——火星上没有板块运动。
None of these volcanoes was formed as a result of collisions between plates of the Martian crust—there is no plate motion on Mars.
板块运动是地幔运动的表面现象。地幔是位于地壳和金属内核之间的一层厚厚的岩石壳。
Plate movements are the surface expressions of motions in the mantle—the thick shell of rock that lies between Earth's crust and its metallic core.
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