Question

what is Sima and sial

Answer 1

Sima (sial and magnesium)
it is the name for the lower layers earth crust
sial (silicon and aluminium)
composition of the upper layer of the earth crust

Answer 2

heya,

Sima means the material of the lower part of the earth's crust, underlying both the ocean and the continents, characterized as relatively heavy and rich in silica and magnesia

sial means the material of the upper or continental part of the earth's crust, characterized as relatively light and rich in silica and alumina

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