Neco Model Questions Vol1 2018 Geography Question 29
Practice objective / multiple choice question 29 from the 2018 Neco Model Questions Vol1 Geography examination.
A rock sample consists of the following minerals by volume: quartz 55 %, feldspar 30 %, mica 10 %, and other minerals 5 %. Assume the silica (\(\text{SiO}_{2}\)) weight percentages of these minerals are: quartz 100 %, feldspar 65 %, mica 45 %, and other minerals 50 %.\n\n(a) Calculate the overall silica weight percentage of the rock.\n(b) Based on the silica content, classify the rock as felsic (> 65 % SiO₂), intermediate (55-65 % SiO₂) or mafic (< 55 % SiO₂) and name the most likely igneous rock type.
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About This Question
This is Neco Model Questions Vol1 2018 Geography Question 29. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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