Undersea Mountains: The Mid--Ocean Ridges Mid--ocean ridges, the longest mountain chains on Earth, are formed at divergent plate boundaries where two oceanic plates move apart.
海底山脉：大洋中脊 大洋中脊是地球上最长的山脉，形成于两个大洋板块分开的不同板块边界处。
Divergent plate
原声例句
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中文百科
分离板块边缘 Divergent boundary
（重定向自Divergent plate）
分离板块边缘是地壳由于张力作用向两侧扩张延伸，地函上部经熔融作用冒出产生新的岩石圈，形成洋脊。这个地区成为大陆的末端，最终形成大洋盆地（Oceanic basic）。大陆板块移离成为裂谷（Rift valley），而海洋板块移离则成为中洋脊。熔岩在板块间流出冷却，形成盾状火山和火山岛。
英语百科
Divergent boundary 分离板块边缘
（重定向自Divergent plate）
In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts which eventually become rift valleys. Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill.
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