Definition of sima in English:

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sima

Pronunciation: /ˈsīmə/

noun

Geology
The material of the lower part of the earth’s crust, underlying both the ocean and the continents, characterized as relatively dense 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.

Origin

Early 20th century: blend of silica + magnesium.

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