Neco 2025 Geography Question 6

Practice essay / theory question 6 from the 2025 Neco Geography examination. This question covers Rocks, Geology .

Neco 2025 Geography Essay / Theory

Topics: Rocks Geology

Question 6 NECO • 2025 • GEOGRAPHY • essay

A field geologist collected three rock samples from different locations on the Jos Plateau. The observations for each sample are recorded below. Sample A: coarse‑grained, interlocking crystals visible to the naked eye; contains quartz, feldspar and mica; hardness 7 on Mohs scale; effervesces weakly with dilute hydrochloric acid. Sample B: fine‑grained, thinly layered; feels soft; contains clay minerals; no reaction with acid. Sample C: black, glassy, vesicular texture; density noticeably high; no visible crystals; does not react with acid.

Question Parts

( a )

Identify the rock type of each sample (igneous, sedimentary or metamorphic) and justify your identification using the observations provided.

( b )

For the coarse‑grained igneous sample (Sample A), determine whether it is intrusive or extrusive and explain the reasoning.

( c )

Discuss how weathering and erosion of the sedimentary sample (Sample B) contribute to the formation of soil in the Jos Plateau, linking your discussion to the rock’s properties.

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About This Question

This is Neco 2025 Geography Question 6. It is one of the essay questions from the 2025 Neco Geography examination.

The question covers Rocks, Geology .

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