What does the theory of plate tectonics maintain ? 这板块构造学说的理论讲些什么?
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Continental drift is now believed to reflect the movement over geological time of underlying plates in the earth ' s crust - the theory of plate tectonics 板块构造学说提出后,大陆漂移说又获得了新的含义,它反映了地壳运动和大州大洋的分布规律。