| 英语作文:Plate Tectonics and Sea-floor Spreading,英语作文 | |
| 英语作文:Plate Tectonics and Sea-floor Spreading:The 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(... http://www.joozone.com/tg/94375.html | |
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