The mineral contents of the upper part of the earth's crust are collectively called the...
GEOGRAPHY
WAEC 2011
The mineral contents of the upper part of the earth's crust are collectively called the sial because it is composed mainly of
- A. silica and olivine
- B. alumina and olivine
- C. silica and alumina
- D. alumina and phosphate
Correct Answer: C. silica and alumina
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