Question

what is known as continential mass of silica and alumina​

Answer 1

ANSWER :

Our earth is made up of several concentric layers with one inside another. These layers are three in number- crust, mantle and core.

Crust: It is the uppermost layer over the earth's surface. It is the thinnest of all the layers. It is about 35km on the continental masses and only 5km on the ocean floors.

The continental masses are made up of silica and alumina. It is thus called sial (si-silica and al-alumina). The oceanic crust mainly consists of silica and magnesium. It s thus called sima(si-silica and ma-magnesium).

Mantle: It is just beneath the crust. It extends up to a depth of 2900km below the crust.

Core: It is the innermost layer. Its radius is about 3500km. It is mainly made up of nickel and iron and is known as nife(ni-nickel and fe-ferrous, Le, iron). The central core has very high temperature and pressure.The continental mass is also called 'sial'. The name sial is derived from letters 'si' of silicon and 'al' of alumina. The main mineral constituents of the oceanic crust are: Silicon. Magnesium

Answer 2

Answer:

•)Sial is derived from letters 'si' of silicon and 'al' of alumina.

•)The continental mass is also called 'sial'. The name sial is derived from letters 'si' of silicon and 'al' of alumina. The main mineral constituents of the oceanic crust are: Silicon.

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