Question

match the following core earth surface, used for roads and building, made up of silica and aluminium, it has definite chemical composition, innermost layer, changes into state, made up of silica and magnesium​

Answer 1

Answer:

Just like an onion, the

earth is made up of

several concentric

layers with one inside

another (Fig. 2.1). The

uppermost layer over

the earth’s surface is

called the crust. It is the

thinnest of all the

layers. It is about 35 km.

on the continental

masses and only 5 km.

on the ocean floors.

The main mineral

constituents of the

continental mass are

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.

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