Definition of sima in English:

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Pronunciation: /ˈsʌɪmə/


[mass noun] Geology , dated
The material of the lower part of the earth’s crust, underlying both the ocean and the continents, characterized as relatively heavy and rich in silica and magnesia. Contrasted with sial.
Example sentences
  • The sial and sima both form the earth's crust which varies in thickness.


Early 20th century: blend of silica + magnesium.

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