托福写作范文之地球板块构造理论
4页1、智课网 TOEFL备考资料托福写作范文之地球板块构造理论您当前的位置 智课教育官网 托福 托福写作 文章正文出国英语考试有哪些 雅思6.5是什么水平 雅思阅读评分标准 托福阅读评分标准 雅思和托福的区别Plate Tectonics and Sea-floor SpreadingThe theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere is divided into a few dozen plates of various sizes and shapes, in general the plates are in motion with respect to one another. A mid-ocean ridge is a boundary
2、 between plates where new lithospheric material is injected from below. As the plates diverge from a mid-ocean ridge they slide on a more yielding layer at the base of the lithosphere.Since the size of the Earth is essentially constant, new lithosphere can be created at the mid-ocean ridges only if an equal amount of lithospheric material is consumed elsewhere. The site of this destruction is another kind of plate boundary: a seduction zone. There one plate dives under the edge of another and is
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