Inside Our Earth - NCERT
silica and alumina. It is thus called sial (si-silica and al-alumina The). oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium) (Fig. 2.2). Just beneath the crust is the mantle which extends up to a depth of 2900 km. below the crust. 2 Inside Our Earth
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