Question

11. The crust comprises two distinct layers of slal and.
(a).sima( )
(b).sife( )
( c).nife( )

12 . The main components of the mantle are iron, silicone and:-
(a).nickel( )
(b).magnesium( )
( c).aluminium( )
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Answer 1

Answer:

1) The upper layer is mainly composed of Silica and Aluminium(SiAl) and is upto the depth of 11 km from the surface. The lower crust is composed of Silica and Magnesium (SiMa) and is upto depth of 11 to 33 km.

2) In terms of its constituent elements, the mantle is made up of 44.8% oxygen, 21.5% silicon, and 22.8% magnesium. There's also iron, aluminum, calcium, sodium, and potassium. These elements are all bound together in the form of silicate rocks, all of which take the form of oxides

Explanation:

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Answer 2

Explanation:

this answer is not true