Read Edit View history 矽镁层 xīměicéng sima Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 矽镁层/矽鎂層 · xīměicéng · sima 2026/03/04 矽镁层 / 矽鎂層 xīměicéng sima The lower layer of the Earth's crust, rich in magnesium and silica minerals. 地壳的下层被称为矽镁层，主要由玄武岩组成。 created sense Mar 4, 2026, 02:25 AM