* The uppermost thin layer of the earth's surface is composed of mainly of the minerals like 'Silica' (Sand) and 'Alumina' (Aluminium). * So it is called Si (Silica) and Al (Alumina). The layer beneath 'SIAI consists of mainly 'Silica' and 'Magnesium'. * So it is called 'SiMa' (Si - Silica and Ma - Magnesium).

Sial and SiMa

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Sial and SiMa

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The uppermost thin layer of the earth's surface is composed of mainly of the minerals like 'Silica' (Sand) and 'Alumina' (Aluminium).
So it is called $Si$ (Silica) and $Al$ (Alumina). The layer beneath '$SIAI$ consists of mainly 'Silica' and 'Magnesium'.
So it is called 'SiMa' ($Si$ - Silica and $Ma$ - Magnesium).

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