| 释义 |
〔supercontinent〕A large hypothetical continent, especially Pangaea, that is thought to have split into smaller ones in the geologic past. Also called protocontinent 超大陆：一块大的假定的大陆，尤指大陆块，被认为在以前的地质时期已分裂成小块大陆 也作 protocontinent〔sial〕Rock rich in silicon and aluminum forming the upper layer of the earth's crust beneath all continental landmasses.硅铝带，硅铝层：由富含硅和铝的岩石组成的所有大陆块下面的最外层地壳 |