完整的岩石圈碎裂成岩石圈板块之后，它们各自作为独立的运动单元，在纬向西漂力、经向离极力和洋底扩张力联合作用下，产生相对运动。
Under the combination action of latitudinal drift force eastward , longitudinal divergent force away from the poles with oceanfloorspreading , they become independent relative movement units .
离极力