It is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part.

很难看出这如何适用于南大西洋的山脊，在那里，非洲板块和美洲板块都没有下沉的部分。

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It is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean.

很难看出这个理论如何适用于大西洋中脊和印度洋脊之间的板块。

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Here Earth's crust pulls apart, and upwelling magma cools and forms new crust that spreads away from the ridge in the great recycling process known as plate tectonics.

地壳在这里碰撞挤压，上涌的炙热岩浆变冷，又形成了新的地壳，这种伟大的循环过程就是所谓的板块构造。

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