Tectonic environment of formation of enriched upper mantle is oceanic crust displacement from the oceanic mid-ridge to the orogenic zone.

造山带富集型上地幔形成的构造环境是：洋壳从扩张脊向两侧运移并最终拼入造山带这段时间内。

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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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The result: underwater mountains and hills all along the axis of the mid-ocean ridge.

其结果便是：沿着大洋中脊形成了海底山脉和山丘。

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For instance, when they pulled the wax plates apart slowly, they found rift valleys which are strikingly similar to those in the Mid-Atlantic Ridge.

ECONOMIST: Geophysics