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Question

The Sial layer is formed of _____ and ______.
  1. silica and argon
  2. silica and aluminium
  3. scandium and argon
  4. sulfur and argon

A
silica and aluminium
B
silica and argon
C
scandium and argon
D
sulfur and argon
Solution
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Sial refers to the earth’s crusts upper layer, it is made up of rocks abundant in silicate and aluminium-based minerals. The word Sial itself is an amalgam of the first two letters of aluminium and silica, Sial runs anywhere from 5-70KM deep from the surface.

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