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The theory of plate tectonics holds that the surface of Earth is composed of a dozen or so huge crustal slabs that float on a sea of partially molten rock. 板塊構(gòu)造論認為，地球表面由十來個巨大的地殼板塊構(gòu)成，漂浮在浩瀚如海的部分熔巖上。