Neco Model Questions Vol1 2025 Geography Question 21
Practice objective / multiple choice question 21 from the 2025 Neco Model Questions Vol1 Geography examination.
Three rock samples have the following mineral composition (percent by weight):\n\n- Sample A: quartz \(55\%\), feldspar \(20\%\), clay minerals \(15\%\)\n- Sample B: quartz \(45\%\), feldspar \(10\%\), clay minerals \(30\%\)\n- Sample C: quartz \(65\%\), feldspar \(5\%\), clay minerals \(20\%\)\n\nFor classification, use these criteria:\n\n* Igneous rocks: quartz + feldspar > 70 % and clay < 10 %\n* Sedimentary rocks: quartz + clay > 80 % and feldspar < 15 %\n* Metamorphic rocks: quartz + feldspar between 40 % and 60 % and clay between 20 % and 30 %\n\nWhich sample is metamorphic?
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This is Neco Model Questions Vol1 2025 Geography Question 21. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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