The sea floor is spreading away from the mid - ocean ridges.

海底正在从大洋中脊扩张开来.

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Seamounts, underwater volcanoes, Rift Valley, the mid - ocean ridge, constitute a rich world of the ocean floor.

海底山脉 、 海底火山 、 裂谷 、 大洋中脊等等, 构成了丰富的海底世界.

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A mid - ocean ridge a boundary between plates where new lithospheric material is injected from below s.

一道中海脊是板块之间的边界,在那里新的岩石圈的物质从下部注入.

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