Why is the layer underlying Sial called SiMa ? - Vidyadip

Question

Why is the layer underlying $Sial$ called $SiMa$ ?

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Answer

The layer underlying $SiAl$ consists of mainly rninerals like "Silica and Magnesium'. So it is called '$SiMa$ $(Si$ - Silica and $Ma-$ Magnesium$)$.

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