Waec Model Questions Vol1 2019 Geography Question 6

Practice essay / theory question 6 from the 2019 Waec Model Questions Vol1 Geography examination. This question covers Rocks .

Waec Model Questions Vol1 2019 Geography Essay / Theory
Topic: Rocks
Question 6 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • GEOGRAPHY • essay

A geologist examines an outcrop on the northern flank of the Jos Plateau. The following observations are recorded: - The rock is massive, coarse‑grained and displays interlocking quartz, feldspar and biotite crystals. - Grain size is roughly 2–5 mm; the rock exhibits a porphyritic texture with larger feldspar phenocrysts set in a finer matrix. - The rock is strongly jointed, with joints trending NW‑SE. - Minor foliation is observed, striking NE‑SW and dipping gently to the SW. - The region is known to have experienced extensive volcanic activity during the Cretaceous and is presently situated within a Precambrian basement complex. Answer the questions that follow:

Question Parts

( a )
Identify the rock type(s) present and justify your classification using the described characteristics.
( b )
Explain the geological processes that led to the formation of the identified rock(s), linking them to the regional tectonic setting.
( c )
Evaluate the suitability of the rock for use as a construction material and suggest two engineering measures that could improve its performance in building applications.
( ) Assess durability, strength and weathering resistance.
( ) Recommend two engineering treatments or design modifications.

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About This Question

This is Waec Model Questions Vol1 2019 Geography Question 6. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Geography examination.

The question covers Rocks .

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