sima

(sī′mə)

noun

Geol. the heavy igneous rock material of the earth's inner crust, forming a continuous shell and underlying the sial and also the ocean floors

Origin: Ger < si(licium), silicium + ma(gnesium), magnesium

See sima in American Heritage Dictionary 4

noun

The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.

Origin:

Origin: si(lica)

Origin: + ma(gnesium)

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