si·ma 
(sīmə)
(sīmə)n.
The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.
[SI(LICA) + MA(GNESIUM).]
| 单词 | sima |
| 释义 | si·ma (sīmə)n. The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium. [SI(LICA) + MA(GNESIUM).] |
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