sima

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sima

[′sī·mə]
(petrology)
A petrologic term for the lower layer of the earth's crust, composed of silica- and magnesia-rich rocks; source of basaltic magma; sima is equivalent to the lower part of the continental crust and the bulk of the oceanic crust. Also known as intermediate layer.

cyma, cima

A molding having a profile of double curvature; one having an ogee profile.