Gce Model Questions Vol1 2017 Geography Question 15

Practice objective / multiple choice question 15 from the 2017 Gce Model Questions Vol1 Geography examination.

Gce Model Questions Vol1 2017 Geography Objective / Multiple Choice Medium Difficulty
Question 15 GCE_MODEL_QUESTIONS_VOL1 • 2017 • GEOGRAPHY • objective

An igneous rock originally consists of 40 % quartz, 35 % feldspar, 15 % mica and 10 % other minerals (by weight). Weathering removes 20 % of the original feldspar content. (a) What is the new percentage of quartz in the remaining rock? (b) Based on the new mineral proportions, suggest the most appropriate rock name.

Answer Options

A. Quartz ≈ 30 %; rock remains a diorite‑type (weathered diorite).
B. Quartz ≈ 38 %; rock remains a basalt‑type (weathered basaltic rock).
Correct Answer C. Quartz ≈ 43 %; rock remains a granite‑type (weathered granite/granitic gneiss).
D. Quartz ≈ 50 %; rock remains a rhyolite‑type (weathered rhyolite).
Correct Answer
C
Correct Option:
Quartz ≈ 43 %; rock remains a granite‑type (weathered granite/granitic gneiss).

About This Question

This is Gce Model Questions Vol1 2017 Geography Question 15. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Geography examination.

Difficulty level: Medium .

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