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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. 板塊搆造論認(rèn)爲(wèi)，地球表麪由十來個巨大的地殼板塊搆成，漂浮在浩瀚如海的部分熔巖上。