When two plates meet at a mid-ocean ridge, their motions create a series of seafloor stripes and, if each plate is underlain by a hotspot, a pair of island chains.

• 当两个板块的交界处是中洋脊，它们的运动会产生一系列的海床条纹，而如果两个板块分别位在热点上，就会产生成对的岛链。