In the text below some words are missing. Drag words from the box below to the appropriate place in the text. To undo an answer choice, drag the word back to the box below the text.
下面的文本缺了一些词。请把词框里的词拖到文中合适的位置；要撤销选择，把词拖回文本下方的词框即可。
In geologic terms, a plate is a large, rigid slab of solid rock. The word tectonics comes from the Greek "to build." Putting these two words together, we get the term plate tectonics, which to how the Earth's surface is built of plates. The theory of plate tectonics that the Earth's outermost layer is into a dozen or more large and small plates that are moving to one another.
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